think i'm 6' with a 7'8 reach. i don't think hand size matters too much even for one handers, you definitely don't need to be able to palm the ball. and even then, you always can just go for two hand dunks. try playing around with low rims and dunking on as high of a rim as you can, and you'll get a feel though. if you ever manage to get 15 inches over the rim though, i'm pretty sure you'll be able to do more than just throw it down lol. probably windmills, 360s, etc