I found the same thing happening to me as well!! The only thing is the take would be different to that of the natural. The fish would slash at the surface as they took my fly but would launch themselves out of the water when it came to the natural. Maybe the movement of the CDC makes it look like the fly has come down and got caught in the surface layer, so the fish dont feel they need to launch themselves at it in case it flies away? Still trying to work out why they wouldn't take 'normal' flies like a Klinkhamer as confidently. Come to think of it I fished CDC Klinks and Normal Klink and the CDC flies WAY outperformed the original!? Especially in these situations.
Around the steel no tortur'd worm shall twine, No blood of living insect stain my line;
Let me, less cruel, cast feather'd hook, With pliant rod athwart the pebbled brook,
Silent along the mazy margin stray, And with fur-wrought fly delude the prey
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