Left the beer for a bit longer, shook it around in fermenter. I got a couple more points and FG ended up at 1.020. Now it's in the keg and I'll have to be satisfied with a 4.2 ABV. Just hope it's not too sweet, can't really tell until it's all carbed up. I keep running into this issue of getting 60-65% efficiency lately. I'm brewing 100% BIAB, my limitatioins are not being able to run grain through 2x, I have to be satisfied with the LHBS mill, which I think should be adequate. I don't stir during mash, but I do during doughing in. I mash out, then squeeze bag but don't sparge. Temps are dialed in for my mash and ferment chamber. The mash temp is held and have calibrated the analogue thermometer on my kettle. I use a SS brewbucket as a fermenter and have calibrated the digital thermometer as well as the Inkbird in the ferm chamber - all are working. I mash at 152 for 60mins, cool down to 70 or just below, airate by shaking and pitch one packet of yeast, then into the chamber for 3 weeks to a month. My OG's are all within desirable range.
This leads me to believe that I am not getting enough fermentable sugars, and is probably a problem run into often with the BIAB method. What I can do is stir once during mash, use my pump to try and fly sparge over the bag with a gallon or so of 170f water (hook up pump from other kettle and run silicone tube into hung bag after mash out--then squeeze), mash lower at 150 or so.
Does this alll sound right? Any other ideas to try?