I switched into smaller X Caddis and Iris Cadis in my box. That meant to be Glossosoma (size 20 with black body). I finally started to move trout. They started to pounce my flies but just looked skeptical.
At the end of the day, I caught a bit larger one of White Miller X Caddis while swinging.
But it was really puzzling. Trout were not interested in White Miller and smaller patterns wouldn't quite get it right............ What was going on??
Little did I know that I would learn more in the next two evenings.......