There have been some really good rubber leg stonefly nymphs on the market, but they have always lacked a little something  weight, movement, flash one aspect has always been missing.
Not any more the rock bottom comes tied on a long shank #10 with a 4mm tungsten bead. A full underbody of lead (no split shot required) a slight flash to the body and rubber legs that go all day.
These are what you need this year.