Keeping the potencies of the 4 main shots in mind, along with +25 with ammo, I would say the shots themselves are fine, procs are fine too. Greedily, I'd ask for the procs to just be 100%, but there's no way we can have that then +25 potency on demand.

Instead, I'm looking at the Overheat mechanic. What if Overheating worked similarly to a balance card, and the party gains perhaps half the damage increase (10 for you, 5 for them)? Because of its short duration, allow it to be stackable with other party buffs. Or perhaps Overheating grants the procs on the shots guaranteed without the required setup beforehand? (Think SAM's Meikyo Shisui) This could allow for use of ammo for further increase during an Overheat. Might seem a bit easy, but the bigger idea is making an intentional Overheat more of a payoff.

With Flamethrower, I originally had the mistaken impression it would leave a burning DoT. I still wonder why this isn't a thing. We're setting things on fire. Come on. I felt similarly about Cooldown. It's a necessity, and a great shot skill, but we're literally purging heat from a weapon. THAT if anything should leave a DoT.

Dismantle would be nice for 10 seconds again, but currently, I just wrench the big hits.