Question about saddle placement
I realize this is a really basic question, but I need to ask. I am having trouble with correct saddle placement. I know that the girth, when tightened, should be just behind my horse's elbow. However, for that to happen, I need to have the saddle fairly forward, and I'm concerned it's too far forward. When I place the saddle so that the girth is right behind the elbow, I worry that the saddle is too far onto the shoulder and is hindering movement/pinching. However, if I slide the saddle back off the shoulder a bit, then the girth is further back than where I think it should be. I don't want my horse to pitch a fit because the girth is too far back onto her sternum.
I have been told to simply make sure the saddle isn't touching the horse's point of shoulder, but I am not 100% clear on where the point of the shoulder is. Is it high up near the withers, or down further than that, or..? I don't want to hurt my horse, or impede her movement, or tick her off by having a too-far back girth. Could my horse's conformation be to blame? She's short with a round barrel.
I ride in an AP saddle right now, but have had the same issue with dressage saddles.