depends. i have noticed at lower weights my punches feel more powerful maybe because of the speed, but I would sacrifice some power for some added stamina.
Depends.. i honestly a whole book i can write to teach you the physics side of Boxing but once again as Small said this is the base of the Total output. The total output can and is changed by many other variables
No, there's no direct connection between weight loss and power loss assuming the weight loss was gradual and that the weight was fat, not muscle. It all depends upon how the weight was lost...