Leaning toward purchasing a new 2020 TLX 2.4 with Technology package. Seats seemed quite comfortable and solid during several test drives. However, just by chance, I sat in a used 2020 2.4 Base (vinyl seats) with 10K miles and I seemed to sink way down into the seat, to the point that my back didn't line up properly with the seat back. (I'm 5'11 and 175 lbs.) Has anyone run into issues with the cushioning giving way, much like what happens in low-end cars, but typically after 50K miles or so? When responding, please include year, engine size, and package (if any), given that there are several different seat types and coverings.