I just finished brewing a recipe that I found on Mobcraft Brewing. It is a maple vanilla porter (out of season, I know). I use two Igloo coolers for the mash and sparge. I am typically around 85% extract efficiency. Today my numbers read, 95%. During my brew session, I have a pump attached to the front of the mash tun. I circulate the wort for two minutes at the beginning, middle and end of the mash. My mash appeared to be partially stuck, so the fly sparge was really slow. Other than that it went like a typical brew day. I have missed my numbers before, but I am usually able to pinpoint where things went wrong. Has anyone hit those kind of numbers with a cooler setup? I know it is unlikely, but can't find any obvious mistakes I made.