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: RIS #2: Pre-Prohibition Lager
Secondary #1: Blackberry Rhubarb wine #2: Empty #3: Cab MerMarqeNac Wine
Kegged: Two Hearts IPA, Pumpkin Ale
Bottles: Carmel Apple Cider, Big 50 Barleywine, Framboise Lambic, Barolo Wine, Berry Rhubarb Wine, Black Currant wine
On Deck: BGSA