The first time I discovered and fished my favorite spring creek this was the exact scenario. After several fruitless hours, my brother-in-law finally got a take on a size 14 Renegade on the surface. I put on the same fly and hooked up with my first ever spring creek brown trout.
It is unnerving to have 20+ inch fish jump clear out of the water chasing who knows what and not being able to determine what it is they are taking. I've felt your pain...
Tight Lines,
Kelly.
"There will be days when the fishing is better than one's most optimistic forecast, others when it is far worse. Either is a gain over just staying home."
Roderick Haig-Brown, "Fisherman's Spring"