8# sounds like too much for a hefe, but that is just my opinion.
last thing...fructose (fruit sugar) is yeast crack. they love the stuff and can just about fully ferment it. the more fruit you add, the drier your beer will be. with 8#, i imagine you will be approaching champagne-ish dryness. it may come across as tart instead of dry, but it will taste different for sure. just be ready for it.