I have brewed 4 AG batches. First batch hit spot on at 70%. The last three have been between 60-65%. I even did a double batch sparge on the last two. I am hitting my temps spot on and holding them well. I mash in a cooler, have done all single infusion, and batch sparge. My volumes are right on. I don't have a grain mill so I am using the LHBS mill. Maybe I am not getting a good crush. I also have not mashed out. I just hit my mash temp, and then hold it for an hour and after my girl of I sparge.