There's a lot to unpack here, but I just wanted to point out a few things:
1. The angle shooter "special stealing" idea is really crazy. Easily my favorite thing here. I actually think it would be better suited as a gear ability like thermal ink. It could steal the amount of damage dealt divided by 10, so one carbon horizontal swing = 10 points. Could be helpful for weapons that focus more on fighting and killing and otherwise annoying everyone.
2. You mentioned the Luna Blaster's competition with Tri Slosher and suggested a blast radius buff. I think the major problem with the Luna vs the Tri is that its mobility is way worse. Even the default Blaster has less endlag after firing (23 vs 26 frames), and that also has better range to take fights more safely. It's already good enough at getting funny kills around walls. If it's going to compete with Tri, it should be more mobile to keep up with other weapons in its range bracket so it could be more effective in every other context.
3. About the Clash blaster, how about having it paint a full, clean line with one blast like all the other ones? That's what they did with Splatana Wiper. Imagine having the Clash compete with Wiper. It would be very on brand. While we're at it, give it the same object damage multipliers as Wiper to give it a niche as an AoE object damage weapon.