I didn't understand your post and I'm sure other people would tell you to clean it up before giving advice, but since this is something I have trouble with with my gelding I thought I'd give it a shot.
When Jackson drops his shoulder 90% of the time I have also dropped my shoulder. It gets better when I balance my weight over the center of my horse instead of tipping to the inside, as long as I'm also supporting his shoulder around the corners / on the circle / etc. I.e.: pushing him up off of his shoulder.
Working on controlling your mares shoulder on a straight line / circle / etc. might also help.
Please take the time to post properly... Any dyslexic members will have great difficulty in understanding you. And other members will get a head ache reading posts with so little punctuation and proper spelling.
I had this problem with my mare. What worked for me is to lift up on the inside rein and apply slight leg pressure with your inside leg. Slow the horse down and use bigger circles to get your perfect form. Have someone else watch you ride. 9 times out of 10 you are slightly leaning or are not balanced yourself. Young horses also tend to do this. Get the weight back on the hind end instead of the front. Good luck!