Dustin,
First of all, I think your tank is looking great! I would definitely ramp up the flow, though, when you get back. The dry rock has so many nooks and crannies to trap detritus, and the more waste we can keep suspended to go down to the skimmer/filter sock, etc, the better. I am going to add a sock and start turkey-basting my rock frequently. I just armed myself with both recently.
I think that is a lot of fuel for a cycle, for sure! How long did your ammonia stick around? Just a day?
I am quite inclined to believe that the MB7 fuels nitrifying bacteria prolifically. The recipe is proprietary, of course, so we don't know what is in it, but it really does seem to fuel a quick cycle. In fact, I think I pretty much missed mine. I was so baffled that I asked about it in another thread. It's brief, but you might have interest:
http://www.reefcentral.com/forums/showthread.php?t=1998736
After 2 weeks, I switched to the "maintenance dose" of MB7. For my estimated 100g total water volume, that works out to about 2 capfuls dosed once every week. I still haven't seen any signs of algae blooms or bacterial blooms, although many people using dry rock (such as yourself) have. Have you followed drummereef's thread in Reef Discussion? He used all dry rock and MB7, but observed a more noticeable cycle than I did. Not long after, he experienced a brief algae episode.
Anyhow, my guess is that your tank has probably cycled, but I'd watch for ammonia carefully as you very slowly add livestock. I'd also work on blowing any detritus (from all that food) out of your rock, and maybe use a filter sock to catch it as you do.