I did my first all grain batch today (Dry Stout). I hit all of my mash temps exactly, but my sparge volumes were way off and I had a very low efficiency. I have a batch sparge/cooler/ss braid set up and assumed a grain absorbtion of .1gal/lbs. My measured grain absorbtion was .2gal/lbs. My volumes were then thrown off. I was expecting 4 gallons at an OG of 1.044 with %60 efficiency, I got just under 4 gallons at SG 1.034. I know with batch sparging best efficiency occurs when both runnings are the same volume. My volumes were way off; is this the reason I have dwarf efficiency? All in all it was a great first crack at all grain brewing, I just need to expect more grain absorbtion next time.