Assuming that you have the CG right, you can compensate for overweight by adding engine power, although an overweight airplane will still be more of a handful no matter how powerful its engine. My calculations indicate that 10% overweight dictates 25% more power, not 10%, in order to get recovery from incipient stall with the same altitude loss. The accurate rule appears to be that available power must be proportional to weight to the 2.5 power.

A good example is the relatively low powered early Spitfire fighters that weighed about half as much as the later versions. Pilots rated the earliest models much friendlier to fly than the much higher powered later versions, even though power:weight ratio of the late models was higher.

If weight is doubled, I think that power must be increased by a factor of up to 5.65, in order to retain the ability to recover from a dangerously low airspeed situation, with the same altitude loss.