I have battling this problem for awhile now and it's driving me CRAZY. I never used to do this - I took lessons with a Dressage coach back in 2005 and also with my aunt (hunter/jumper coach) around then and this was not a problem.
Fast forward to last winter (less then a year ago) I started lessons with the same Dressage coach again - and I have this wonky shoulder that's dropping like crazy and making me look like a hunchback. I CANNOT feel this - when someone tells me I'm even, I feel so unbalanced it's like I'm going to fall off. We took lessons with her briefly but her schedule was insane, so we stopped after a couple months.
I am desperately looking for a coach right now and it is downright PATHETIC how few of them we have - everyone I know is booked solid, and it's looking like I may have better luck finding a really good pony clubber to help me out. My aunt will be back end of November to help me out, but until then, I'm screwing my poor horse up!
I have somewhat resolved this problem by actually shortening my one stirrup in my Western saddle - these photos show me English with my stirrups the same length. I have back problems, and my chiropractor actually informed me I have so much hip tension that my one leg is several INCHES shorter then my other leg.
Any help would be muchly appreciated - since seeing how bad I've gotten in these photos, I've essentially stopped riding. I'll be letting Jynx gain some weight and doing ground work with Zierra while she's off, and hopefully losing more weight (I've lost 8 pounds in a month, YAY!) You can be as harsh as you want, I really need to know EXACTLY what I'm doing wrong here and how I can attempt to fix it, or if I even CAN fix it without a coach (I somehow doubt it as I NEED someone to tell me I'm doing it, but Shay-la has been very good at being my eyes lately, so if someone has a suggestion, she can watch from the ground). I've been riding my entire life, but I am a Western rider at heart and have only had periods of scattered English lessons in my life amongst being almost totally self taught from a young age riding Western.
Sorry for the novel and thanks in advance!
REALLY shows how badly I'm dropping my left shoulder and scrunching my hip - my comments on my Dressage test said it's actually causing me to drop all my weight into my right stirrup and screw my horse up
Head on shot
This is a really good photo to show how bad it was this summer while trail riding - this was before shortening my stirrup:
And this is from the same show, showing the slight improvement when I ride in my Western with a shortened stirrup: