Cut the plactic clip off.
It's not necessary and it's a pain in the butt (as you have discovered).
Doing a "Wicked Dick" (getting knocked off your feet and swinging behind the boat), you really want to stay hooked so you stay with the boat. Usually, you can steer the boat into irons and climb back on.
Don't trapeze with your feet on the hull. Get good siderail carpet / nonskid / rubber (whatever your preference) and set the trapeze a little higher in waves so you've got more weight on your feet. Turn your forward foot so the toes face forward (you have to turn your body a bit on the trapeze to do this). This puts more contact area on the siderail and streamlines your foot / leg so it's not so easy to knock off.
