Join Date: Mar 2014
Location: South Louisiana
First of all, what do you mean by "ducking out of the circle"? If the horse is dropping it's inside shoulder going to the right, then bringing it's face more to the right should tend to help pick up that shoulder. Leaning to the inside makes this more physically difficult for the horse because they have to pick up your weight in addition to the already dropped shoulder.
You really want to be sitting balanced, but if you had to pick a spot to lean for this issue, it would be a little bit back, and to the outside.
I'd also advise that while you are working on lateral flexion here that your legs play a large roll as well. Giving your horse an inside leg to guide him and help lift his inside shoulder will help tremendously.