I really don't know too much about hydro setups, so I won't pretend to know. However, I'm sure bud size and potency is the same in hydro as soil, so from the start of the grow to the final harvesting all effects it. My recommendation is to fill out the hydro troubleshooting form and if the hydro guys on this forum see something that they might change to give you better results they'll probably say something. You might also start a grow log and post that. I've gotten and seen lots of help coming from people on the outside looking in.:thumbsup::thumbsup: