This might sound stupid but practice 360 & actually tucking your legs but not throwing yyour arms. Once you comfortble with that throw your arms out. That helped me alot
thats how i leaned 180 tucks on quarters, i can tuck in the bars with a 360 just fine and the 360 part isnt my problem because i can 720 its just when i throw my hands out my scooter comes out from under me
i cant pinch my bars with my knees. i keep my legs sorta straight and and i want to be able to use my knees. here is a vid to see if you know what im talking about...