:BibleThump: I wish to thank @happybadger @ItalianMessiah and countless others for their words of wisdom. It took my dumbass 3 months to get this done, never mind my previous failed attempts.
Does this flush look sad and pathetic? I have no idea, but these shroomies are mine and I am filled with hope that their potency can help me reach communism.
There's a fine line between the two. In this case it's the brown spotting and mottled grey on the overly-engorged caps which indicates over-misting. That's water sitting on the caps because there's too much in the tub for it to evaporate. The walls have a consistent film of moisture rather than a few stray beads which to me indicates 85-95% RH. When it's too dry the caps will be thin/leathery/split, the walls will be totally dry, the pins won't develop into full mushrooms, and the substrate will look leathery and devoid of pins.
edit: A gauge is also a good idea. Slight water beading on the walls is the rough approximation of being in the right range.