calling all MCH players

[Lastelli]

so overheat dump all dmg into wildfire then barrel stabilizer back to 50 after burst?

Pretty much, yes. There are exceptions, like when a boss is going to jump you can overheat even if stabilizer isn't ready (possibly during a last wildfire before the jump) and use flamethrower when the boss is away to go back to 50 heat but in general it's just as you've written.