Oh gosh. I thought I was the only one who felt it hard to do dressage/flatwork in a jumping or CC saddle. I swear I couldn't NOT sit in two-point position. I was always riding forward seated.
I never took thought into the panels being shorter therefore less comfortable for the horse. Granted, I never ride more than an hour. Oh greenies and their short attention spans. :p
I guess a GP/AP would be the way to go. Right now I don't have a job, but I'm hoping to get another one in the next couple of days. Then I'll have more saddle money! Haha. Jumping in a GP/AP saddle might just make you have a better and more secure seat then since it's a bit deeper and less forward to get into two-point.