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: Berry Rhubarb Wine #2: Black Currant Wine #3: Ice Shanty Bock
Kegged: Border Crossing Vienna
Bottles: 2H IPA III, Carmel Apple Cider, Spruced Winter Warmer, Big 50 Barleywine, Framboise Lambic, Dark Belgian Strong, Russian Imperial Stout, Sparkling Elderflower Wine, Barolo Wine, On Deck: ??