I've fished them pretty consistently over the years. Depth can be important, especially if they are bedding and the best way I know get a slow level retrieve for gills is to carry 3 different weights and distinguish them by using different colors of tying thread as an indicator. Gills aren't picky and the head color isn't likely to make a difference to them.
I'm not one to stick hard to patterns when i think it isn't necessary. Bluegills have always seemed to be suckers for any bulky wet fly that has noticeable yellow or red on it. That is why I left the original McGinty and started tying a sparse hackle instead of wings. I don't know that I ever used hen hackle or partridge, but I would today probably , especially the partridge.
They also seem to like any small dark topwater that has legs.
I didn't read all of this, but it looks as if he has some variants.
McGinty