Who was the clinitian? Did the clinitian get on your horse at all?
pull my reins into my pelvic bone,
I don't understand this - you pulling your reins down into your pelvic area, creates a stiff rider, and then creates a braced, stiff, on the muscle horse.
I've never seen a clinitian tell their students to pull the reins with such contact, and keep their hands near their crotch - that's baffling to me?
As Wild Spot said, proper hand carraige is to be sought after, because when you do this you aid your horse to be lifted up/come up into you, you aren't giving them something to lean into, and by you carrying your hands, you obtain functional, moving aids.
My old horse pulled like a steamtrain... lol. And he loved jumping. He would race around and harge the jumps
Nelson used to be like this as well, and if I don't ride him correctly, he will be like that.
I remember one of the first times I rode him, I was out on the cc course. I remember doing just a small BN fence, and by the time I was able to bring him down under me - we were already on the opposite end of the cc field.
So I signed up in a clinic with Dorothy Crowell when she came to our barn for our local Pony Club. She helped us immensly.
LOL, I remember doing the 3 jump combo that was set up - and he took the strides that were supposed to be done, in a much less amount of strides. He was so strong, I was literally standing up in my irons trying to stop him.
So Dorothy pulled us aside and worked with us 1 on 1. She really emphasised flat work, but correct flat work - using Seat into Legs into Hands to Soften.
Seat first, always and foremost. Engages, slows *your horse always comes down to the rhythm of your seat* your seat must always remain functional *3 points, 2 seat bones and crotch* and must always remain balanced.
Then legs, your legs are there to lift your horses ribs up, they keep the rhythm created through your seat.
Hands always come last. They must be functional to allow the energy your seat and legs created, to recycle back through.
I have a completely different horse now. COMPLETELY. ONLY if I ride him correctly.
Seat into Legs into Hands to Soften. Never hands first.
Remember - Jumping is Dressage with speed bumps. The fence is never of importance, it is control and rhythm. Always go back to basics, always go back to Dressage work.
If you are stiff, tense and locked - so will your horse. Our horses reflect what we are doing in the saddle 100% of the time.