There was an older post where a taller guy who like the 'flat' seat bottom complained he had no headroom when it was adjusted how he wanted it.
Being a tall guy myself I thought he was crazy, but if you do level the bottom cushion with the power controls the seat is up very high so he was right.
I like the back of the seat bottom lower and knees up, but I'm sure some drivers dont. We had a '14 express Ram with manual seats for a while and I felt like I was going to slide off the front of the seat every time I stopped. The seat bottom was horizontal and I hated it, there were no adjustments for the tilt of the seat bottom. But you may like that seat angle.
Its a shame you had to buy the truck to figure out you dont like the seating. Myself I'm very happy with it and can spend 10 hours on the road with no problems, both my '15 with cloth and this '16 with leather feel the same to me. But not everyone is the same, I have bought cars/trucks I hated and took a huge loss bailing out after a few months. In the long run I was probably better off rather then getting annoyed every time I drove it for years. Only thing you can do is try to modify it to suit your tastes, I'm sure a quality auto upholstery shop can do whatever you want.