The 3rd gens use the gimmick of tilting the seat bottoms back to make you feel you're in a "bigger car", which, of course, doesn't work. They are trying to hide the fact that you're basically sitting near the floor(like all small cars).
They're just tilted back, which makes pivoting around to see behind an act of extreme contortion.
I had the seat bottom re-stuffed with very firm foam, so the bottom feels like one of those racing seats.
Then, I added 1' spacers below the seat's rear leg attachment points in the floor; now it's not tilted quite so far back.
Next, soon, I plan to peel back the front of the bottom seat cover, and shave away about 1/2 to 3/4" of the bottom front bolster, a section that rises up, cuts off circulation to my legs, and again gives that "tilted back in the chair" orientation that I dislike.
UPDATE:
Tried this today, but the mechanical structure of the non-power, SR5 seat was way more complicated than my previous 2nd gen SR5 seat, so I abandoned that adventure in favor of of a much more elegant, but experimental, solution:
I'm leaving 80 to 100 pound of sandbags on the offending high-rise part of the seat bottom. This should, over a period of weeks or months, crush it down(so the theory goes) and I'll be left with a denser, de-sprung, lower foam area at the bottom front. We'll see............