I recently brewed a coconut brown, and I have to tell you that the oil can be a problem. I roasted the hell out of the grated coconut, and I also blotted the oil out with papertowels as much as I could. I still ended up with a fatty/oily layer of crud on top of my beer in the primary. I tried to rack out from under the layer of fat into a secondary. I got most of the fat out of the mix this way, but not all of it. I even have a very small layer of oil on top of each bottle after bottling. BUT.... with all of this said, my coconut brown has a great coconut flavor and backnote and it didn't kill the head. So, long story short.... roast the hell out of it, and get as much oil out of the flakes that you can!