@gottatrot I realized that about the saddle being too far forward at some point, so I got off and fixed it. But I didn't take any pictures of it on his back like that. He seemed a little happier once I had fixed that, but still not super happy.
And yes the saddle a really interesting billet set up. The instructions on the website said to start with the girth where I put it (second and last billet straps) at first. Then, if it creeps forward, to change where it's attached. I will do that for sure, when the saddle fitter comes, and maybe take pictures of it also.
Really interesting about the girth. If I end up with a normal saddle, and not a treeless, I'm going to re-evaluate my whole girthing set-up. I was reading some other stuff about girthing the round, no-withered pony, and I need to ask the experts here what you guys think about it. Also, maybe the dressage saddle (the last saddle I ordered, the one I'm waiting for the right gullet to come) will be better because of that. I do have a true mohair string girth that fits him (or used to) with a dressage saddle that has the longer billets. That girth is nice and thin.