I have a few BIAB batches under my belt, and have done them a few ways. The last one was simple full volume mash with no sparge at all. I was as close to my numbers as I have gotten, and the beer came out good, so no complaints. I have done the dunk sparge method and that worked out pretty well too. Still working on consistency, but I am still a novice. I am going to move to a cooler mash tun here soon as I want to see how that works out. So far, the only brews that I have made that did not hit the mark were because I screwed up the process