Please, I need some saddle help

Desoto saddlery makes 16 pound saddles, custom for your horse. I am thinking of getting one as it was recommended by a saddle fitter for my flat, short backed ,wide horse. I also rode english and cannot lift those heavy western saddles. However I do have a older ralide tree Circle Y round skirt that fits my horse and my last horse who is also wide and mutton withered. The problem is its so old that I hurt riding in it. Silly me I had new fenders and new sheepskin put on it a few yrs. ago but forgot about my poor butt!