We've been missing take after take on our res. just lately. Mainly in flat-calms and light ripples. We've tried foam beetles, by far the most effective pattern over the past few weeks, sedges, shipman's buzzers and even down to size 20 Griffiths Gnats - and we're still missing 'em!
You might think could be down to the leader but we've been rubbing down and degreasing regularly with fullers earth.
I know I have a tendency to strike too early - I am very excitable,

but my mate always watches his fly-line for movement - and we're both missing takes!
I put it down to the trout! This phenomena always seems to happen in summer, when the trout are lethargic - I'm sure that when the cooler weather comes the takes will be far more positive - why? I can't explain.