I place a "Therm-a-Rest Lite Seat" on top of my WaterMaster seat. I bought it at REI. It provides extra padding for comfort, and insulation for warmth. I bought some Velcro to attach it, but I have not found it necessary. There always seems to be something to place on top of it, to save it from a gusting wind before I sit down. Therm-a-Rest also makes some other seat pad models that vary in size.
Another forum member also mentioned the "REI Lite-Core Sit Pad" as an option.
I find the seat pad works best starting at half-filled, then let some more air out via the accessible valve once you are on the water. This way you don't feel like you're sitting on a bubble.
I had a problem with BUTT pain from my southfork, same seat as yours, I changed the angle of the seat higher in the front and that cured the sore ass problem. My outcast pac900 has the same seat and it feels just fine. Another item is rod holders ,you have brought this up before. I have 4 scotty rod holders on my toon, Go buy one and try it out.
mumbles you are not allowed to comment on the sore ass .
If you look in the picture, I too use the scotty holders.
My old man just said he finds the molded plastic seat collapses after time.
I get the tilting back thing though. We had some boats called the ECHO by Venture Outdoors that had straps on the back of the molded seats so you could really tilt them back. That did make for a more comfortable ride.
Like I said though, the seats don't bother me. I guess I will look at those REI cushions for the old mad though.
I tell you this, being lucky enough to own both styles (framed and frameless) the seat on the frameless is unbelievable.