FlyingStone is very much correct. As regards the seat position. From my experience, a click too high = float and a click too low = crunch.
Of course, spot on also gets those landing results too from time to time
I am not a line trainer or TRE so take my advice with a pinch of salt. Firstly, smoothness of touchdown is a bonus, not a requirement. Your target should be on centreline, on the touchdown markers, pointing straight and with the vertical speed sensible.
If you are not already, scan the VS the whole time. You will spot what the aircraft is doing before the glide slope shows it if you are scanning the VS. If you are there or thereabouts at 50ft the landing is likely to be safe and satisfactory.
Finally, ensure once you cross the threshold you are looking at the far end of the runaway. Looking at the touchdown point doesn't allow you to judge the vertical speed accurately and makes it harder to land the aircraft consistently.