Replying to Spinning fast???

i need some help doing bigger spins, i can do up to 7's but whenever i do one its all sketchy and i cant grab or anything. even with 5's i can hardly ever do one with a clean grab.
its not cause the jump is too small, i usually do 50 ft and up. i think i might be using my arms too much, for a 5 or 7 i usually do wind up quite a bit, and i sometimes go a little off axis, and i get so lost and sketchy in the air. when i watch other people it seems like they hardly wind up at all for like 9's.
so does anyone have any tips?