It's funny really, how very different, certain horses feel to us. Years ago when I first took riding lessons, I learned on a very big horse with a long stride. It was all I knew. After that, riding smaller horses, felt odd to me.
Later in life, after I was used to riding my Saddlebreds, I rode a QH, which I had intended to purchase. With his low set head carriage, I had the strangest feeling that I was going to topple off, over the front. There was nothing but air in front. I had become used to looking through horse's ears.
All my life I had ridden English, so at one time, decided to purchase a western saddle. So, so very different. Riding western, seemed to constantly give me back pain. I had a bad back anyway. I even purchased a really nice and expensive, Fallis western saddle, with the stirrups hung forward. Didn't help much. I think it's what one becomes used to, in horses and riding. Takes a bit of time to get used to different horses and styles of riding.
Incidentally, I also tried some good Aussie saddles and liked them very much.