You're on the right track.
Looks like you started with all new rock, will take a bit of time to come into itself. Personally, I wouldn't worry about dosing yet, water changes should get you to where you need to be. I think you're right, you are feeding heavy, but that's OK, why are you running your skimmer part time, it could help you keep feeding heavy!
I'm also a big fan of the bare bottom, something I did to help speed up diversity was get rocks, sand, shells, etc from other friends tanks. I'd put the sand in a plastic container in the display, or the sump. If you're worried about it, because when you reef with somebody, you reef with every person they've ever reefed with, remember.... unless you plan to QT all your inverts, fish, corals, etc, then you're already taking that chance!