I think what im going to do is let it ferment down, kill off the yeasties, and add more concentrate, then bottle. I too, plan on making this one again. Let us know how your next batch goes.
I tried this one a few days ago on Sunday. 2 fruit punch, 1 apple/raz, 5# sugar. In a 3 gal carboy. It's bubbling away quite nicely right now. But it tasted a little light on flavor, did you add any more concentrate before bottling?