Just so you know, Watsky isn't actually a big fan of speed rapping either. He's talked about it in several interviews. He got famous from a speed rapping video online so I guess he feels the need to give those fans what they want sometimes, but he has a bunch of great songs where the rapping is a much slower pace.
Watsky is pretty damn cool, you should check out his song "No Flex Zone" ALSO If you're into video game raps, the best one on RU-vid (IMO) is Dan Bull. Especially his "Watch Dogs" rap and his "GTA V American Dollar" rap, think you might like it! Also his Mafia 3 rap (more recent one of his) I'm definitely subscribed to you now, keep cranking out the reactions!