Hey as long as it fits you and your horse that's all that matters!!
I ride with a thinline pad just because i'm paranoid about hurting my horses back even though his saddle has been professionally fitted to him as well. I'm going through the same thing you are - trying to get my horse back up to weight after a bad winter the one before last. Man it takes FOREVER. Ugh. :(
I've ridden in a collegiate dressage but something about the way it fit me had me bumping around on the pommel. Just odd. For me of course. The lady who owned it rode beautifully in it. Funny how that works.