I'm really not a fan of OH with a FT tick, but I can't really argue against it. just the clunky design I despise, not the efficiency with it. I just feel any channeled ability should not be intended to be broken midway (or early way here), as the restriction of channeling with no other action and no movement should bring a reward somehow.

FT is pretty hard to fit actually, as using it for AOE will overheat you withouth it taking the damage boost, and overheating withouth it is a long and painfull unneffective way to AOE.

They could as well cut the cooldown and duration by two now, since you already overheat in 5 ticks starting from 0.