Join Date: Dec 2010
Location: southern Arizona
My experience and mine only: On my gelding, with his short back, a western saddle gets a lot more up & down motion than with my Aussie-style. I never did figure out how to sit in it with his canter.
What HAS worked is to roll a bit onto my thighs, using a forward seat in a western saddle. Remember, a western saddle puts you farther back, and also has a stiff tree that extends past the cantle. By rolling forward on to my thighs, the saddle can flop up & down behind my butt without moving me.
My mare has a longer back (although she is still a short-backed Arabian), and her canter is smoother. Also, I suspect a collected horse will be less bouncy, just as one on the correct lead is smoother.
Then I have a little BLM mustang pony who has a canter where you can sit & roll a cigarette mid-canter. It is his TROT that makes me want to pee blood.
All just in my limited and sometimes unorthodox opinion...good luck.
Do your legs move much, or is it just your rump in the saddle?
"Make the right thing easy and the wrong thing...well, ignore it mostly."