Back up to my original post...you certainly fish with one of the flies I suggested. Your three Boudreaux's are a pretty good imitation for..." a Scud" !
As for patience tying #18's, I don't know, I think you can do it. 18 is a relatively large size midgewise. Just takes tying a few up. Try some Miracle nymphs or a Brassie.
All species of fish eat scud and midges.
"As far down the river as he could see, the trout were rising, making circles on the surface of the water, as though it were starting to rain."- E.H., The Big Two Hearted River