I see a lot of things here I agree with and a lot of things here I disagree with. To save myself some time, I let's just say that the best way to handle some of these problems is to buff weak things so that there are more viable options. as an example, I love the Hydra Splatling! But I also recognize that it is a rather weak weapon with the meta so focused on short range in this game. If they were to make the charge speed on this just a bit faster, then it would be more reliable without changing the fundamental focus of the weapon!
@MotorGamer I like the idea of Splatlings being able to hold a charge, but giving Brellas a dodge roll? I get the idea. Make it so you have a movement option coming out of shield. But wouldn't that make Brellas a bit to strong? Giving them two extra defensive options instead of just the one kinda of takes away from the Dualies and gives too much to the Brellas which, once again, leads to balance issues. Also the buff you mentioned for Tenta Missiles makes some sense. It would also give some reasoning to running Cold Blooded.
As for the problem of the vanilla Blaster, increasing its charge time I think should be enough. But I do also think that Splashdown itself is a bit too strong. The issues, as I have stated before, are that the blast radius is not properly shown and that it comes out too quickly on a game where the online lag is certainly noticeable if nothing else.
I can also agree that the Dualie Squelchers need something, but what would that be? What kind of a buff would they receive that doesn't make them OP? More damage? Increasing it from a 4-shot to a 3-shot kill seems like overkill to me. Maybe make it so that fall off damage is either lessened or isn't a thing on the Dualie Squelchers? That might work. Increased movement? It already has decent mobility and dodge rolls. Better Ink economy? It isn't exactly the most ink intensive weapon out there tight now, but they could buff that I suppose. Improved accuracy? They've already buffed it once and the turret firing mode is likely what they were considering for better aim.
Look, I'm all for doing something to improve the Dualie Squelchers. But what more could be done without the weapon encroaching into the niche and territory of other weapons? Make it a 3-shot kill and there would be almost no more need for Splattershots on a team comp save for their specials. Make it so you can run faster with it and that will eliminate things like the Splattershot Jr. and the N-Zap. Make it so it is essentially 100% accurate and then you have no need for the Splash-o-Matic or the H-3. The problem with the Dualie Squelchers, IMO, is not with the weapon itself. It's the current meta.
Everything that's considered strong right now is all close range with few exceptions. There's a reason why there are so many Splattershots and Sploosh-o-Matics running berserk in every mode of gameplay. There's a reason why the N-Zap is argued to be among the best weapons in the game. There's a reason why Splashdown is the most common special to see being run. It's because of the metagame practices. Why is the meta the way it is right now? Because we asked for it to be. We complained about all the weapons that had range in the first game. The E-Liters/Chargers in general were too strong. The Splattershot Pros were too polarizing. The Dynamo Rollers took too little skill for as good as they were. So, when they designed the maps and weapons for this game, long ranged weapons were put on a back burner so that the short ranged weapons could be strong. Now that they are too strong, complaints are being made about that. As far as this ol' so-and-so is concerned, the biggest problems with the first game were the Kraken and the Bubbler. Invincibility in a can was going too far. Now perhaps I have a bit of a bias as I do like my long ranged options, but there are some things that didn't need to get stepped on. Long ranged weapons didn't need to get sacrificed to the altar of the overly-aggressive, in your face 24-7 players to be happy. I don't know an effective way to fix it, or if anyone else even sees this as a problem, but one thing to take away from this whole rant is this: No one really knows what they want or what they have until it's gone.