i use the tiniest bit of tube liner just as a knot protector. I find they hook and hold much better than with a fixed hook. The same goes for Sunrays too. In general Keirstream's advice about small hooks holding well applies accross all skated flies. I use a 12 B990 on a free hanger on a sunray with a 41/2" wing. I used to use a 10 but found the 12 hooks and holds better. The same applies to the hitch, if in doubt go smaller.
Thank you Sir and the rest of you for helpful hints.