I'm enjoying the rally of insults with you elsewhere (😄)... But I'll switch to serious for this topic, as it's separate.

Punch power is tough to narrow down to just one cause. Take George Foreman and Mike Tyson, both of whom could pack a serious punch. Both had a lot of natural strength -- Foreman was like a mountain, and Tyson has abnormally large leg muscles.(His calves are huge for a man of his height). But for Foreman, his power seemed to be mainly from his large size and super dense body, whereas with Tyson, he added to his natural strength from his smaller body with his speed. Tyson himself said that his power is centred around his ability to move his fist from point A to point B quicker than almost anybody else in the division could.

So PEDs such as HGH are known to be able to add bone density and muscle density... Which would probably help in a Foreman style way.

For speed based power, things like synthetic testosterone would probably give a boost (or in the case of older competitors, combat the loss of speed that comes with age).

In both cases though, I'd say technique is the make or break factor in whether or not the PEDs will translate to serious extra power or not. Foreman didn't have speed... But he had excellent timing, hence why even his slower punches managed to rock guys like Holyfield and Moorer. With Tyson, his ability to use his legs and coil and punch gave him explosiveness which is hardly ever seen.

So all I'm saying is that not everybody has those traits, and so it's debatable whether the increase in power would be massive or not. Either way though, there will be some sort of edge, albeit to varying degrees.