That’s… definitely an opinion?
B) because, as I said earlier, if he punched tombstone too hard he’d break his own fist. Spider-Man punching harder doesn’t suddenly mean his fist can take it, his normal punches against tombstone already hurt himself.
simplest conclusion is that when Spider-Man stops holding back, he can oneshot tombstone(as he does to most his villains), and that webbing his hand increases his hands dura(which is already fairly obvious, for the same reason punching with a boxing glove protects your fist, this is true whether or not it also increases his AP, which I highly doubt, since there’s nothing saying he punches harder with it on, and it on somehow increasing his AP doesn’t make much sense. He’s also explicitly used his web punch with fire proof webbing to punch a dude that’s on fire, meanwhile not mentioning it makes him stronger or anything)