try a grab, to point the board down to bring swing radius in.
kinda with the board slanted one leg straight other bent at the grab on the end . centers everything right under the axis.
once i started trying rotations mostly on transitions keeping my head closer to the main seems to be a good seed control element, like an arm out to
slow things ...arm or head closer in speeds it up.
rotations and flailing body parts really falls into gymastic spin acrobatic control stuff . this stuff takes fine control and lots practice.
i am neck and shoulder injury prone and it really has me cautious with these elements esp on land.
oh yeah one handed is the order of the day def helped me control 360 better , probably why i hurt may shoulders at the start!
hope it helps , no 720 here , not on purpose any way.