Gerald,
It would be helpful to know what types of strops you have? kangaroo, plain leather, balsa, etc.
And no, the lapping film does not automatically give you a sharper edge. It is mostly in technique which is what determines the edge.
Some people here have had good success w/ lapping film whereas I have not (so far). I tend to stick to and like the stones better. I go up through my 10k choseras and then just leave that edge but “polish the grooves” left by the 10k’s with some .125 cbn. This is what I currently do for my straight razors, although I do have some 15k shaptons on order from Bob at Oldawan tools currently.