I really, really like microjig flies for crappie. A pink or red painted head with white marabou and a red thread collar has done the trick many times. Also a red head jig with a red marabou tail and yellow chenille body is a hot fly for old paper mouth. A 8 1/2 foot sinking leader with a 2-3 foot tippet should get you down deep enough. I've also had good luck with a chilli pepper fly.

Mike B