What do you mean by this? Wrapping all the way up to the end? I stop about 1/8" from the very end to give the varnish some room to taper down. Yes I use varnish (usually 10-12 coats) and not epoxy. I dont mind the extra time for better control of the finished look.
I wrap ferrules with the same color scheme as guide wraps. Meaning if I use trim bands on the guides I put trim bands on the ferrules to match. Trim bands near the edge of the ferrule is probably the most difficult part of wrap for me, but I think it looks more consistant. Same scheme goes for winding check and hook keeper(if added).