Nope, probably never will...
What are some good weapons at I can use to get there? I was doing good and winning a lot with the Dual Squelcher yesterday but now I'm about to go back down to B.
I think the mostly used weapons in A+ are Elite 3K, splattershot (all variants), squelcher SP, Gal family and Dynamo Rollers (though I´ve been seing less of this one lately). I´m not A+ myself (currently A), but I´ve played a lot against A+ and I always come against people using one of those. I myself changed the Standard Roller for the Dynamo and am doing pretty well with it.
However the most important thing is to learn how to play each mode. This is a team game, which means that you must always prioritize the team objective before getting a good K/D ratio. Specially in Tower Control I´ve been seeing that a lot of times the team who wins has a worse K/D ratio than the one who lost. Conversely, when I get an awesome K/D ratio my team loses more times than it wins, but when I get a bad or average K/D ratio (eg: 9/8, 4/5) we win most times. In Splat Zones however I think it´s more important to stay alive for longer periods and for example, look for a position to continue inking the zone safely instead of engaging the enemy so when your team returns it´s much easier for all of you to clear the opposition. But well, I use a Dynamo so I can defend a location easily against almost any kind of weapon.
Also, try to do unexpected things. A common mistake I see is whole teams being destroyed time an time again in the same location. If the enemy has a hold of the center in the Skaterpark don´t rush in to the splatzone through the shortest path, try instead doing a detour from the path in the right to surprise the enemy. Maybe you´ll be able to get them and break their hold, maybe they´ll kill you but you have become a distraction that has allowed the rest of your team to push through...Don´t wait to do this until there are only 10 seconds left, sometimes I do it right at the start of the match so if the worse comes to happen I have already inked the way.
Always keep an eye on the map so you know where your teammates are and what they are doing and be careful when superjumping. In general, NEVER JUMP TO THE SPLATZONE! 9 out 10 times there´ll be someone waiting for you.
Hope this helps