I've made about 10 brews on my BM 50 so far and have hazy beers as well. I've noticed that the wort gets nice and clear while recirculating, but as soon as you lift the malt pipe the direction is reversed, and no matter how slow or careful I am, the grainbed gets disturbed and I get all sorts of grain stuff in the wort. I don't know if or how much boiling this stuff affects flavor, but I haven't made any great beers yet.
I too ferment in a uni-tank and can clear it up pretty well with a cold crash, but never get really bright beer.
For what its worth, I've always done different recipes of styles ranging the full color spectrum from pale to stout. I'm not sure why but they are always darker than expected and all share a similar not-so-goodness.