Tried some exposures last night, implementing your advice! Tried an outdoor exposure, with a test strip, and the developer cooled to 65 degrees. There was quite a bit of improvement!
The test strip - (f8 with .5 second, 1 second, 1.5 second, and 2 second exposures):
First exposure - (f8 with .3 second exposure):
And third - (f8 with .5 second exposure):
Oddly, even with the longer exposure, the second full exposure seems less well exposed. They were processed the same, and the light didn't seem to change much, but they were shot between 6:30 and 7:30 in the evening, so I wonder if there was a dramatic shift in UV light between them?
Also, I imagine the dark blotches are artifacts from tray development?
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