Those long thin leather straps on your saddle......take them off.
Put dollar bills in between your inner thighs and lower legs and you will find your weak areas quickly. Once you can hold your dollars for at lease 5 minutes without dropping them at the walk trot and canter then try it over small cross rails. If you have a trainer have them lunge you over a cross rail so you can tie up your reins. You can put your hands on your hips, out to the side, on your head etc. while you are jumping. You can even try it blind folded so you don't anticipate. You should try none of these things until you are strong enough on the flat, or you will end up on the ground. Your forminites above have great insight.
