Shit, Wilson Farms has gotten pretty damn LARGE lately. I have fond memories of going there to buy Thanksgiving fixins before my parents divorced. Last time I visited, I was simply floored by the expansion. That place on 2 in Concord is pretty outrageous too.

I have no experience with Hempy Buckets, but in general, you can creep up gradually on your nutes until you see slight tip-burn. The trick is to keep them BALANCED so you don't get lockouts earlier than that. Then when you see that you have gotten to your maxiumum feed level for that plant, write down the amount you used, the strain, the size of the plant and the maturity at that time, in your logbook so you know what it likes at that age. And for the next feeding, don't give any nutes. Then next time you feed, go back down in concentration just a bit. You want to know how high you can go without burning.
The only thing I would worry about is that I don't know how you would flush a hempy bucket if you had to, so probably it is even MORE important not to overdo the nutes.