I like to use swiss straw that has been treated with a few coats of "softex". I found that the dryer sheets and tvek options create upright wings that "helicopter"...the swiss straw softex wings look great but will collapse while casting, yet spring back into shape, thus alleviating the helicopter effect.
Just use a small strip of swiss straw 4-5", open it and work it smooth and flat. Apply a coating of softex, let dry, repeat.
Some examples of upright wings :
March Brown
Heptegenia
Drunella flavalinna