You may want to look at the Fichtbauer. It’s not particularly well known yet in the US, but it is an incredible game changer. I resisted when I first learned about, and tried most of what has been mentioned above, and I could kick myself for waiting so long. This saddle, and the way it is constructed, is balanced on the horse’s back in a unique way that has made all the difference for me and my horse, who freely gives his back and the change in his happiness and willingness to display his natural athleticism is obvious. The placement of the stirrup bars encourages a much more correct leg position. It is custom, with specific measurements of both the horse and the rider (and can be done by you). The leather can be upgraded, but the standard is far, far superior to any of the leather used on other saddles I have owned. It is distributed in the US only by Sycamore Station - find them on FB.
ETA: I included lots of decorative add ons, and did not get close to that price tag. (and it is gorgeous!) And, we do have a saddle fitter trained on this saddle that makes regular trips to the area for checks, etc.