Back 5050s and Front boards. I can't fucking front board a flatbar, I've done it before but I've gotten close to eating the rail and I just don't try them anymore. I am terrified of back 5050s also (even on ledges) especially after seeing my friend smash his face on the floor on an over-waxed ledge. I've probably done more flip back 5050s than back 5050s tbh, and those can be counted with fingers on one hand. I just can't control my ollie properly it seems. I am doomed to suck ass at ledges and rails.
Crooked grinds as well, used to have them on rails but now I just get into a noseslide when I try them on ledges. I can think of every way I'm doing it wrong but I just can't bring my body to do it right, it's annoying as fuck!
Also, switch pop shuvs and switch back 180s. Man I am blowing it!