I think presentation is more important than pattern, but the ones I have had a lot of success with are:

#16 gold-ribbed hare's ear soft hackle nymph
#18 partridge and orange
#20 partridge hackle with a crystal flash white body
#20 partridge and red wire wrapped body

And I gotta say that in deeper, slower pools you should try a size 16-20 primrose & pearl tungsten beadhead zebra midge on sunny days and olive or rust if it's cloudy, early morning, or late evening.

Use 6X or 7X fluoro tippet for all subsurface presentations. Lighten up the drag, use a 3-4 wt. full flex rod, and have fun!