Sounds like a lot of blueberry, but it also sounds good.
I did a Sunset Wheat clone with 2 oz extract and 1 lb sanitized blueberries in 5 gallons of wheat base beer. Good mixture of light blueberry flavor and aroma. I will likely go the same amounts next time.
Primary #1: Empty #2: Empty
Secondary #1: Empty #2: Black Currant Wine #3: Empty
Kegged: Umlaut my Kolsch
Bottles: Big 50 Barleywine, Framboise Lambic, Russian Imperial Stout, Barolo Wine, Berry Rhubarb Wine
On Deck: Dusseldorf Alt III, BGSA