Haha, good idea about weighing the larger ones. I'll have to keep that in mind.
And as for the peeing, Caesar is the same way which is why Reptichips didnt work well for him. He didnt always pee urates so finding a pee sucked. Aspen works so much better in his case. And yeah, even here in Washington State, aspen keeps everyone around 65-70% which works fine for them. You read these things of people saying boas and retics need high humidity and high temps but what i've found is my snakes all seem to enjoy the temps around 77-80F and humidity around 65-75%. Anything higher with each and they start pushing and trying to get out.