That's an interesting line of thought. Though, wouldn't that necessitate making the Mk. II 4 fight only every other turn on paper? That is... overheat to 2, jump away to cool off, come back to overheat 2 again, jump away to cool, etc.?
Granted, I suppose in reality it's more like 'Do 4 damage consistently, spike to 6 when it's a good idea, then jump away to cool off, return to do 4 more for a while, spike to 6, jump away to cool, etc.'?
Edit: Meant to say 6, not 7, damage.