User blog comment:18emerc/Superboy and his abilites/@comment-3285234-20130220081704/@comment-34954086-20130220090515

His genes were incomplete, the patches suppress his human genetics so he only has the incomplete Kryptonian genome. Missing half a genome results in deterioration, in other words, Superboy will end up looking like Match.

Face it, that is the payoff for Superboy getting any more powers.