Corntua "where oh where are you"

OK I know this year has been a really weird year but to miss a hatch is not something that happens much but I can't seem to find the Cornuta (sp Drunella) blue wing olive duns and spinners. Was at Penn's the other day and spent most all afternoon and evening at Johnson's Pool, t/o the day the water looked a little brown but as the sun went off the water it became more like the color we know, lite olive. Took a few small fish in the heavy riff using a bigger yellow stone dry with rubber legs. Began to see more rising fish T/O the pool and of course I had my olive spinner tied on but noticed as I waded out into position it was a good hatch of ISO's big and juicy duns! Took quite a few fish on top that were not great but still nice fish. Video will be attached soon showing how think they are but not overly large. I got out and began to walk along the bank looking for the good ones in mid-pool, OK spotted one at the old swimming hole rope pine tree, he was just poking his head out and taking emergers or duns like a pig! It took a long time for me to get out picking my way on the rocks all the while trying to stuff my vest into my waders with my Go-pro chest harness on but the water was not that deep at this spot a bit above the pine tree. I got into position and left him feed downstream and moving up then doing it over again, got a good float over him and that big mouth just come out of the water and came down on top of my floating nymph, set the hook and he was on and really heavy, be cool and not get too excited, turn the camera on- OH SHIT I lost him!*#! I left a sting of swear words the must have scared all the birds because it got really quiet. I looked at my fly #12 2x long ISO floating nymph and saw why, the hook gap was small and with that big jaw I really never got a good hook penetration on him, that has been corrected! I saw another good one mid stream above the new wood obstruction, it took a bit of time to get his location but on the first good float- he gave me the brown trout finger, that full body swirl refusal never to return. All in all a great day but still know olive spinners?
  I have to guess that it might be the weird weather that has the olives screwed up, can't check Coburn now because of the "rubber hatch" there, last time it was 40+ of them!

  I also have or will attach a video of Johnson's pool.