Actually, though I don't have direct experience, fans (assuming fairly standard computer-style fans) always seem to break in combat. They can't handle the shock forces. I'd be inclined to avoid them if possible. The nature of modern compact machines is such that they'd probably be smothered to the point of being ineffective anyway.
In terms of power, it depends on realism. If the 300a setup can truly do 300a, as in, pulling anything up to 300a in a 3 minute fight absolutely cannot kill it, then that's fine. That'd give a weapon 15kw to play with on 12s, which combined with efficient control is plenty for a top heavyweight.
The issue is that the vast majority of hobby level ESCs simply can't do what they claim, and that's infinitely frustrating and getting old very fast. So far it seems the only products on the market that truly, reliably do what they claim come from MGM. The top Kontroniks maybe too. So we don't need another 3-400a esc that will blow at 200a for a few seconds - do whatever you need to do to get beyond "hobby amp" ratings within reasonable cost and you'll be very popular!
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