Right... an energy free myth drone that does 150 dmg/turn... with a charge and hook that do 300 dmg and a myth anihilation that does 300-360 dmg... what a combo... basicly just put life on the mech and heat engine... and it become unbeatable.
Since the dmg per turn goes to 750-810... yep seams balanced.
We are talking about balancing the game not makeing new OP builds. Why not make also a death punch phis that does 600-900 dmg... no energy needed... just to make things better. So your setup looks like this... 2 anihilation, myth hook, myth charge, myth energy free drone, and 1 phis death puch... and then strap 5 myth platinum plates 315 hp each, and 3 heat engines(89 heat cap, 42 cooling), you should land around 2800 hp, 200 cooling... and dmg potential of 1050-1310 / turn... that should nail it.( sarcasm included... actualy only sarcasm)