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dramamine
You don't need much runoff at all in hempy buckets....and putting plain water or low ppm solution is a bad idea. All you really need to do is make sure your reservoir at the bottom of the bucket never gets totally dry...this way all the salts stay in solution and never crystallize and cause problems.
The plant takes what it wants from the reservoir. You can feed a bit lighter than you are now...reason being that the plant has a steady source of nutrient solution from the res. If your runoff is consistently higher than your input solution, just lower the EC slightly. Otherwise you're just feeding extra nutes that you will later flush out.
On that note, why are you feeding once a day? The whole point of the bucket is that there is a reservoir in the bottom that will feed the plant for at least several days....
You should read the original hempy coco style thread by hempy himself (if you haven't). It's the most simple hydro method there is, but as hempy bitterly lamented...people complicate it or use it while second guessing whether or not it'll work as stated.
The only reason I stopped running hempys was because I don't want to have a bunch of giant containers in the veg area....not enough room. The technique is awesome, though. I use it on a lot of my vegetable plants outside.
Oh, and are you letting your nute solution sit for awhile before you ph it? It's a good idea, because ph can and usually does change within a few hours of mixing. Best to wait and ph it after a few hours at least.
Good luck...hope some of that helps.
