I've used a similar recipe -- and I have to say, it produces a great product. I've done two batches with 100% wild blueberry and a couple with cultivated berries.
I'd like to do a 1:1 comparison of wild vs. cultivated, just to see...
I find the blueberry to be very viniferous in quality -- it makes a terrific wine. I have increased my fruit to about 18 lbs of blueberries per 6 gal batch -- I also find I have to use a fair amount of acid blend.