Welcome Mike! You're our first member and I hope just the beginning of things to come. Perhaps you can give us the below knee amputee perspective.
Percherons are wonderful horses. I have one here now, and my other horses are drafts as well. Are you riding in english or western style? Drafts are hard to fit because they are wide, round backed, and have low withers.
There are many companies making western saddles with a "draft" tree (8" gullet). I have one and it works well. But, others have found that arab tree saddles work as well, as arab are broad with round ribs, too.
You might also look into a treeless saddle - although I can't specifically recommend it yet, as I'm still investigating. I posted a link in one of the other forums.
Has the chiropractic craze hit your area? Here, many people are having their horses 'adjusted' by equine chiropractors. I haven't used it, but some claim it's excellent!
Again, welcome!!
Ann
RAK amputee, Michigan
Western/Trail riding
Spotted Draft Horses