Anybody here tryed another stabiliser on the mosses commet 637 front wing

been riding it for a while and finding it difficult to Jybe,feels a bit unstable

Riding t60 sport board,1111 mast and 420 rear stabiliser. I'm unsure how to improve this set up,open to suggestions on different wing combos but ideally would like to keep speed

have tryed 695 (to slow for me)
550 I liked with 420 but again bit unstable .

What do you mean "unstable" ? Is the carve unstable or the platform when changing feet?