Keep more constant pressure and more of it upwards on the saddle to increase and keep the connection of your feet on the pedals?
Also “grip” the pedals w/ your feet. Before I broke my back I could do this on my bike and pull the back end for hopping up stairs, etc. I don’t remember quite how I was able to do this gripping though. Now on the uni if I pull my feet inwards towards the axle just a bit (not enough to move them, just some tension), my feet stay on better.
-The tuck- when you jump can you pull your legs up and hit your chest before coming back down? I’d practice trying to do that before doing it on the uni. If you can’t part of the problem is prob flexability. Stretch the whole back of the leg, achilies, glutes and hips. I think a good target would be comfortably squating w/ both feet flat (achilies), and a standing forward bend w/ both palms flat on the floor (the rest).
