I made a coffee stout with 4 oz of cold brewed coffee. 4 oz of coffee grains and about a liter of water and let it sit in the refrigerator for 24 hours, then filtered it (which took forever). I put all of it in the secondary. Coffee drinkers think this brew was delicious, and its very very...
I've used 8 oz in the secondary, and the brew just tasted like coffee. Which I don't really like. Since its cold brewed its smooth coffee and coffee drinkers seem to this it is delicious. For just a coffee hint I definitely recommend scaling back.