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: Umlaut my Kölsch VII #2: Empty
Secondary #1: Empty #2: Empty #3: Cab MerMarqeNac Wine
Kegged: Mugged a Monk Paters
Bottles: Dark Belgian Strong, Black Raspberry Rhubarb wine, RIS, Carmel Apple Cider, Big 50 Barleywine, Framboise Lambic, Barolo Wine, Berry Rhubarb Wine, Black Currant wine
On Deck: BGSA