Replying to Tips on not over rotating flips

Loon just built some bigger park jumps I'm gonna say 25 feet maybe and 30-35 ft and I can clear both of them fine and want to throw a backflip and possibly a flat 3 but since I've been doing those tricks on smaller jumps I feel like I might over rotate too much and slam and on my backflips I can't really lay them out good enough to spot my landing like half way around so any tips on how to time the rotation better?