Congratulations :thumbup::thumbup::thumbup:
Did you jump from 600 right to 1500? If so, did you get all the scratches out from the 600? I would put at least one, maybe two intermediates in if you want the finest edge. Like 800 and 1200.
On the other hand, sometimes I do that jump myself, to get a good toothy-polished edge - makes a great slicer but not quite so good at push-cutting as a finer finish.
The hair whittling (for me anyway) comes after a good stropping. You really need a finely polished edge for it,
The real trick is to not just push-cut through the hair, but to split it lengthways or slice curls into it like a feather stick! Takes a steady hand and good eyesight as well as a sharp knife.
A little practice and stropping and you'll be making feather-hairs in no time!