Thats surprising. I've not done hempy yet but I'm going to start a hempy bucket within the next week or two. After doing a lot of reading on them they seem pretty simple in comparison to DWC for example. Hempy is definitely supposed to be faster than soil. How do you feed in hempy? something like feed - feed - water repeat? what medium are you using for your buckets?
You might have ran into a problem that I've read about. I don't remember the name of it though. Apparently the roots never reach the res at the bottom of the hempy bucket. Instead they reach the top of the bottom layer of medium and pool there instead of reaching through the perlite at the bottom and hitting the nute water.
The roots hit the bottom I can see them through the drain hole. Hempys are pretty simple. I've grown some nice plants in them. I had a nice sweet seeds growing, two road runners all at the same time. Feed,feed water and repeat. I went by the hempy write up in the hydro forum.I'm using 100% perlite.