Yeah broncoman, a lot of differences not only in preference, but in how we're built individually. Seats are one of those things you just can't give advice on without saying "but try it first" when making recommendations.
I actually liked the stock seats too, but only for about a half-an-hour max. On longer trips they just killed me! I put older ('91) Mustang GT seats in and never felt that way again. Four or five hour trips were nothing. Of course, the view out the windshield was just killed after that. I'd lower them in a heartbeat, and have been contemplating cutting the floor for just that reason.
As for moving it back, I did mine about 3" or so and that was perfect. Simply drilled holes where I needed them and used my own fabricated "nut-plates" under the floor. Not necessarily the best way, but quite effective.
Used 1/4" plate, drilled and tapped, and with a nut welded on in addition. So thread engagement is the thickness of the material in addition to the nut, and the plates spread the load over a larger area than the stock ones did, so I feel pretty secure.
Time well spent under the truck in my opinion. Now, if we'd only make the Viewfinder available in mild steel too, and dip it, instead of the more expensive stainless...!
Paul