Yesterday I finally trotted Serenity for an extended amount of time. Long enough to figure out that she is REALLY ONE SIDED. I believe I know the cause, now to fix the problem.
I believe I'll lunge her after riding her, starting with 5 mins on each side. I would love for this to be fixed while out on the trail, but haven't found a blog/website that describes what exercises I can do while out there. I do know that lunging builds muscle and balance if done correctly. So, I suppose, I'll have to use lunging.
In the meantime, I'll count sits on each diagonal. And change the diagonal that I sit on EVENLY.