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are you getting adults/large crix? if so your die offs may not be due to anything you are doing. The cricket virus kills adult phase crickets quite quickly. Ghann's is still up and running but only selling up to 1/2 inch sizes as they were one of the only cricket breeders that was not affected by the virus so everyone bought their adult crix to try and replinish their own.
I found that when I switched my crix to an aquarium with a screen top they don't really die much anymore. I think I lose about 3-5 a day now. Mine never did very good in the plastic bins.