I’ve had the lowers since their release and helped beta test the uppers. I’m 5’6 155lb and even for me the first few months I felt like I was sitting on phone books, especially compared to my original 2002 foam. That said, they have broken in comfortably and can do a full day wheeling without any lower back pain and I’m happy with my driving position.
I’d give it some time depending on how much butt in seat time you have regularly, or if you’re on the taller side, look into the seat lowering brackets.