Here’s what I see: Too much guessing. Too much assuming that it’s not a trout rather than assuming that it is. So don’t guess. Set the hook. And set it hard.
If you’re trying to get long drifts, change that. If you’re trying to guess what’s a rock and what’s a trout, change that. If you’re trying to lift the nymph off a rock, and then you realize it was fish — bump buh-bump and gone — change that. I suggest a fundamental shift in your approach . . .