I felt this way would be better than a flat damage nerf. I'm glad it's going over well.
Solid approach, I like it. I still feel it's range is a touch long, but I'd be completely happy with just raising the other mechs' ranges as I feel they are too short.
Can't shrink it down or it wouldn't work in higher difficulties, and would be really bad against some bosses. There's likely to be range upgrades added in the future (slight since there are only a few right now).
Played to level 3 (using the awesome Brawler Mod). The damage is still fine. I'm not concerned with the range per Hearteater. It already has 15% less range.
A sticky flame upgrade or a increased life flame upgrade would be fun.
How often do primary weapons spawn? If the Flame Tanks schtick is he always have the flame thrower, then some of his level upgrades can make his gun more powerful in ways other than just 10% damage.
I wasn't going to nerf it into the ground
Just address the overall power level. I gave that to Misery to check over.
Upgrades- No and No. No that they aren't cool, it would have to be a level up perk just for the Flame Tank, and then just for that one weapon. I'm not to keen on that.
Weapon spawns - No idea. Item pools and spawn rates are adjustable, but I haven't messed with any of that to see how it works (not keen on doing it soon either).