I'm not a pro, but here are my thoughts:
Before the heavy July rain, I thought the cutty fishing was normal. The water temps were great (wet wading with no excruciating pain to the feet), bugs were hatching, and lots of fish to be had on the dry.
After the July rain, I found that fish were harder to come by. I'm blaming the higher water flows and lower temps for this, as it seemed that the fishing were rising a little later (when the water wasn't as cold, ie. my feet didn't feel like they were going to fall off). I waited until there was a good week of warm weather before I returned to the cutty streams and was rewarded with some decent fishing days, but not as much surface action. I would say I've only been catching about 50% of my fish on the dry (and the rest on the dropper), when usually it would be 60-80% on the dry.
I've found that rivers like the Liv have been getting a little tougher to fish on the dry since I've started fishing there in 2001. I remember in 2001/2002 sitting on a certain hole that held over 150 fish, and catching 50 fish between the 3 of us in a couple of hours. Over the last 8 years, the productivity of that hole has diminished as the fish have gotten bigger (and probably smarter). This year, I didn't get any in that pool, but landed a few nice ones in the faster water above it. My fish count has decreased, but the average fish size has increased. 16+ inchers were tough to find back then, but now I usually get some 18+ inchers (and sometimes 20+") in a typical day.
I used to get away with fishing a green drake most of the day in mid-July, catching 20-30 fish with the one fly. Now, I need to switch up my flies a lot more and go smaller. Also
Overall, I would say this has been a good year for cutty fishing for me, but not as many on the dry. Every year I'm working a little harder to catch them, but have been rewarded with bigger fish on the average over the 8 years I've been hitting the cutty streams.
Just my observations...