Hope you don't mind if I sit in on this one, nice looking set up, sorry to read about the blueberry bliss. I have a similar set up to yours (home made instead of a tent though) and I use a Phillips Tornado 75w=280w cfl and a mars 48 reflector on growth and bloom, the cfl is about 5 inches above and the reflector is about 30 inches above and I seem to have good results. The spots look like calcium deficiency, if your ph is 6.5 (perfect for soil) then I can't see it being your water, if it does get any worse you could try a little cal-mag, I use pro-cal from week 3 through to flush even if they don't look like they need it. If the new growth is ok then I would just leave it be for now and see how she goes. Hope everything goes well