I think starting a thread is a great idea!
I love my dressage and how open it is but I ride in a more flat seat model. There are so many options!
I’d start by posting pics from the side and behind so posters can give you an idea of what saddles may work for your horse. While you can adjust the gullet on a Wintec you can’t easily (if at all) fix a saddle that is too curvy or too flat.
Seat size is more than butt size my husband is tiny but he rides in an 18” forward flap dressage just to accommodate his very long femur. Otherwise his leg is jammed against the thigh blocks.
If you have a store with a good used saddle selection go and try them out! Make notes what is comfy for you. Forward flap vs standard, deep seat vs flat, where the balance point is, etc.