I crush hard enough to where I get stuck runoffs on occasion. So I either just deal with it, with patience, or I throw in a handful of rice hulls and be done with it. For whatever reason, I haven't really needed rice hulls for wheat beers, but it comes in handy when using a huge amount of rye (e.g., 40%), and probably oats too. In my humble opinion, if you don't get a stuck runoff every once in a while, then you're either really awesome like Denny and have your mill tweaked exactly right, or... you aren't crushing hard enough. Close that gap on your mill, or double crush, and watch your efficiency rise. On the other hand.... I also have a theory that too great of an efficiency can adversely affect malt flavor. So for that reason I recently opened the gap on my mill. Not to mention I was getting more than a few stuck runoffs.... play around till you get it right for what you want. To me, an average 85% efficiency is plenty. I don't need to get 95% efficiency but with a lot of stuck runoffs, no thanks.