system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] So we all know Spider-man pulls his punches, but how did he figure out how strong is too strong?

IMO as an amateur boxer, you can only measure how much damage your punch can do to a person precisely, by punching someone and seeing the results, specially as an outboxer, some times faster is better than harder.

How did Peter figure out how much gas he should put behind his punches? We see Dr. Ock rip scorpion's jaw off with a punch, we can assume he wasn't punching at full force since he didn't see scorpion as a serious threat, proving that point, did Peter kill or heavily injure someone/a few people before figuring out where to start pulling?
gpt
If he's subconsciously worried enough about something happening, his spider-sense will go off if it's going to happen. In other words, it can warn him about abstract dangers, not just actual physical dangers. A case example of this is that his spider-sense will go off when he's about to change into/out of his suit and someone is watching, saving him from putting his civilian identity in jeopardy. Same thing probably happens with punching regular humans, he worries about hitting them too hard so his spider-sense helps him know when he's about to go too far.

In the same vein, Superior Spider-man punched someone's jaw off because he wasn't worried about that happening.