I just brewed a Belgian Tripel, roughly 14 lbs of grains. My utilization was quite low, like 55%, much lower than my past 5 AG beers. I mashed at a higher temp (158) to give some body. I mashed for about 45 minutes. One thing I noticed is that not all the grains were wet in the middle at the bottom of the mashtun--I didn't stir it enough. Not sure if that is the sole problem here, or if anyone has other thoughts. I'll correct it with another lb of sugar in the secondary--I only used one pound originally so I should be OK.