Thanks,Ben and Daniel.
Ben, yeah, the mosquitoes started in on me the second afternoon in the Willow Lake area. But I was ready for them with long woven pants and shirt with some strategically sprayed permethrin, and one of Peter Vacco's headnets. In addition, I got the idea of using stick DEET from Jorgen Johansson's book and found it was a lot easier to use than the creams. So the mozzies didn't score on me even once.
For some reason, flies tend to gather in the SL2 harmlessly near the peaks. Only one mosquito found her way inside, and I just swept her out. Both nights were spent at elevation, once around 11K and the other at 12K, and it tends to get cool there, so the mosquitoes just disappeared after a while.
Daniel, I like to use the same strategies as you. It becomes a kind of a game to figure out when and where the crowds will be and plan to avoid them. It's really sweet when it works out like on this trip.