The Griffiths Gnat has become my fail-safe fly over the past few seasons and wouldn't leave home without one. On our particular water I've found size 20's to be the most useful.
I buy mine from John Norris as it's a bit of a strain on the eyes tying the small stuff these days.
I find though that, after two or three trout, they do get damaged and, if I were to tie them myself, I would include a rib.
Your flies look excellent, with perhaps a smaller, neater head, and I would see no need to change them.
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How poor a thing, sometimes I find,
Will captivate a greedy mind - Isaac Walton.
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