Power [available] is only one element of the equation, there'll be more to it than that. Different aircraft will react differently to the forces in a loop. More power may not be the fix for a erred loop entry. When you were trained in stall recovery, hopefully you were trained to allow the plane to accelerate as you pull out of the dive, to prevent a secondary stall, there are elements of this in completing a loop also. Thinking about, and discussing this is good, attempting it without competent training is bad.
I like altitude for that margin of safety during aerobatics, but, I suppose altitude is not what is ideal for aerobatic displays to a crowd on the ground - it's a dilemma...