I bought the Model 36 from an out-of-state friend awhile back, but had never shot it, due to serial health issues it was over a year since my last previous range visit. It is a 1971 model square butt with the original walnut grips (and beautiful perfect bluing, it has not had much use). I had tried dry-firing the new version (which has a round butt) in a gun store, where I thought the trigger was fine but the grip was way too small, and the sights hard to see. When I saw the photo of my friend's with the square butt I thought that would solve the grip issue. Part of the problem last week was undoubtedly that I not only hadn't been shooting, I didn't do any shooting-related strength exercises the whole time I was dealing with my medical stuff... for example I could not shoot my 686 one-handed last week, which previously I had been able to do quite accurately with either hand. Right now my tentative plan is to get back the strength in the relevant muscles (fingers, forearms, chest), then put rubber grips on it (someone here recommended Pachmyer (sp?), they look good to me) and get the trigger polished and try again. If it's still horrible then I'll probably put the walnut ones back on and try to sell it.
My objective for carry ammo is #1 accuracy, and to do the best job of stopping the BG. The Hornady specs made it sound perfect for the latter, and as noted previously it was accurate in my 686 and soft to shoot, so I was happy with it.
Re the 90-grain version vs the 110, when I first got my 686 (which was my first gun) I asked the RO at the LGS/range where I bought it which version he would recommend for his mom, he said the 110, so that's what I bought.