Why Peter will never beat Wlad, but everybody else...

[Hulk]

.....I don't think it's because of the slowness of his punches but more the fact that they only come one at a time which gives even hurt fighters time to block or recover

I don't think they only come one at a time. Look at the second Toney fight, Peter threw 3 jabs, and the third landed on Toney, knocking him down. He just throws the looping right hands one at a time.