Hi Josh...I am sad for all your problems and do wish you the best in getting recovery for both you and the trees. I was in Bend the first few days of July and it was a bid warm for sure. I went out to a native tree nursery there where they had a group of newly collected Mt Hemlocks that I was interested in. Looked to me like over 70% of the trees were going to die and the rest were not well. I went home with nothing unfortunately. I live in Baker City, Or, (NE Oregon) East of you a ways. We had the heat here also. I'm glad that I had purchased some sized 50% shad cloth earlier and had it up when it happened. I think the hot, dry heat, dry soil, to much hot sun, and the temperatures of pots and soil can be deadly along with all the moving you did. Bend has a bonsai club and is a very good place to collect conifers also.
I lost several pines and one spruce here, but think I overwatered with not the best soil. Best to you! August