Base: Stockpile energy faster and become way way stronger much quicker than he should be getting. Very scary unless his body adapts to fit this faster as well.
2nd: Lmao idk probably end the world
Fa Jin: Permanently active and making him way faster and stronger, builds up faster, probably changes his physical form
Danger Sense: Sense more than just hostility, like other emotions, and with a wider range. Might even give slight future sight when he senses something
Blackwhip: more powerful and out of control, more strands, will be coming out of his whole body whether he wants them to or not
Smokescreen: more smoke idk. Maybe starts turning his body into smoke? That would be interesting, a Smoke-Smoke Fruit if you will
Float: more momentum from floating, idk much more than that, very hard to improve upon ability.