Sure, here are a few tips:
Keep in mind, Tower Control is the mode I play least, so these might not actually be much use for you. Also this post is very long. And there will be no TLDR, sorry.
1) Neutralize the enemy team before pushing the Tower at the start of the match. Either kill 'em all, or get them in a position where you won't immediately get splatted for trying to ride the Tower. This is crucial to getting a good start, since if you don't do this, you'll probably just get killed, and then the enemy team will push the Tower after killing your teammates (or otherwise preventing them from stopping a push for a bit), which means they're in the lead (why this is bad for you in a few points).
2) Beware of Blasters. Blasters' AoE attacks let them easily kill people riding the Tower, so you'll probably see a lot of them. If you see a Blaster coming for the Tower, you should probably hop off and deal with them before hopping back on, or just splat them quickly if you're not riding the Tower.
3) If someone's on the Tower, you should just stay nearby and pick off anyone who tries to hijack the Tower. This way, if someone goes after the guy on the Tower, you can deal with them, and if the Tower rider gets splatted, you can hop on to keep pushing if it's safe (or if it's not safe, but you really need the extra point or two).
4) KRAKENS ARE PAIN. They can effortlessly take the Tower, or hold it by staying on, and their usual weakness of being locked to melee attacks isn't so bad when your targets are on a tiny platform. Get used to seeing them.
5) Bubblers are arguably even harder to handle than Krakens, for two reasons. Firstly, you're invincible, but you can still use your weapons (including subs) while surrounded by a Bubbler, so Bubbled players can not only ride the Tower with no fear of being splatted, they can fire back if you try to push them off. Secondly, Bubbler can be passed to teammates. This is why I'd argue it's harder to deal with Bubbler than Kraken; simply put, any teammate can get Bubbler once it's been popped, so they can all be invincible while pushing, whereas a Kraken can only be one person (though you can have multiple Kraken-users). Bubblers can be pushed around though, so you might prefer Krakens for actually riding the Tower (though Krakens can be pushed off too, it's not as easy), but Bubblers are still very good for Tower Control, at least in my opinion.
6) Killer Wails. If you see one, GET OFF THE TOWER. You'll get splatted if you stay on, or get pushed off if you pop Bubbler or Kraken to survive it, so it's best to just surrender the Tower for the few seconds it gets dubstomped, then take it back.
If you're using Killer Wail, point it at the Tower. Always. Unless your team's on the Tower, then wait until you see an area enemies can shoot down onto the Tower from and aim it there when they line up to do that, or just hold it until you're about to lose the Tower and then fire it at the Tower to prevent it being taken by the enemy.
6x) Inkstrikes are actually pretty good here, since they can just be fired on the Tower's path to force enemies off for a second (if you're not in control) or to disperse enemy ambushes (if you're in control). Not as effective as a Killer Wail, but good nonetheless.
7) When you get a sizable lead (like, your score is below 40, or below 30 on smaller maps), if you lose the Tower, you can just play defense until time runs out. It's easier than continuously pushing for a knockout and probably less risky, since they have to push deep into your territory to take the lead away from you.
As for weapons good for TC, you should get good mileage out of the Tentatek; the rapid-fire shot is pretty good (get a feel for the end of your range though, it'll be good to know when going up against Splattershot Pros and Jet Squelchers and stuff with longer range than the Tentatek), throwing Suction Bombs at the Tower from afar is a good way to harass tower riders, and Inkzooka is good in most situations (get good at aiming it though, missing can be fatal). The .96 Gal is also solid option. You'll miss occasionally near the end of your range, but throwing a Sprinkler onto the pillar in the middle of the Tower lets you ink the ground as the Tower travels (good way to charge Echolocator and get map control at the same time if you're pushing), and Echolocator is always a nice thing to have up (plus Sprinkler lets you generate it fairly quickly). The Carbon Roller could be alright as well; the fast flick can be good for invading the Tower, Burst Bombs can harass (and soften up) Tower riders from a distance, and Inkzooka is a great all-around Special, as covered above. I wouldn't go Deco though, Seekers and Seeker Rush just don't have the upward reach for attacking the Tower.
If you feel like branching out a bit, you could try the .96 Gal Deco. It's the .96 Gal, but it has the Kraken for taking the Tower with ease. It also has Splash Walls, which can be placed on the Tower while riding it, which is incredibly useful (for how to do this, here's a video:
since it lets you ignore one direction briefly (nothing can penetrate the Wall, not even Krakens (though those do a lot of damage to it)! Inkstrikes and Wails get around the Wall tho, so still get off if one of those is coming your way!) or fire through it at would-be attackers.
Also, the Custom Range Blaster is a good selection. It's a Blaster, so you can attack most of the platform with every shot, Splat Bombs can be thrown onto the Tower to force riders to get off or position themselves so the central pillar blocks the explosion (but you can shoot them while they're there) or over cover to attack farther-away areas, and Kraken is Kraken, nothing more needs to be said about it. You'll need to get used to how it works, but it's very good, at least I think so.
Alsoalso, one last suggestion: Splat Roller. Its flicks have good power and alright speed, you can roll to create an inkroad for your teammates, Suction Bomb throwing at the Tower is a good move when you're not in control, and Killer Wail is just awesome for TC. Bit slower than you're used to for Rollers, but I'd argue it's better for TC than the Carbon.
Hope that helps. Sorry about the length.
The game just took the rainmaker and put it back in the center of the game, but that could have been a really bad situation. Talk about handing the other team a win if they had caught up with him and taken control of the rainmaker.
