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Have you done hempy buckets before?
I was using the same 80/20 mix and it just never dried out. I never watered it to the point of it spilling out of the drain hole and it was still constantly wet. I put a new hole about an inch from the bottom and that didn't work either. 2 weeks after harvest the damn stuff was still wet. I considered doing a bottom layer of hydroton to thin out the moisture but ended up just going back to soil instead. This may be further exacerbated by the low run temps of your LEDs.
My experience with hempy was that it worked better in smaller taller pots with a smaller base for a reservoir. All my little clones in soda cups were great and then nothing but trouble in the 3 gallons buckets. On the larger ones I really had to take it easy on the water where as with the small ones I would water until they drain. There may as well have been no drain hole because getting it to that point would have for sure flooded them.
Also the plants seem looser in the perlite than in soil so it pays to stake or cage early because when the plant gets big it tend to feel wobbly. Mine did anyway.