I always add wings, that's the way I learned to tie flies and that's the way I do it . Many times, a grayling didn't take my wing-less flies, but after changing the pattern by adding wings, it became a killer.
take care now

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God Grant that I may live to fish until my dying day, And when it comes to my last cast
I most humbly pray, When in the Lord's safe landing net I'm peacefully asleep,That in His mercy I be judged, As big enough to keep.