I also found the front seats a little uncomfortable at first but found an obvious solution (that worked for me, anyway).

I just turned the back adjustment dial almost all the way up. I tried that when i first got the truck, but it didn't feel right, so I lowered it back down.
Finally, after months, I turned it back up again. It took about an hour to get use to it, and the discomfort went away. I think I resisted this setting at first because I liked the more "buckety" concept, but that was what was making my ass sore all along.

Yeah, I know, obvious...I imaging anyone who bothered to complain already fiddled with the adjusters till they were blue in the face... but just thought I'd mention it...