Today was my second AG recipe. 11 lbs 3 oz of grains. Milled it last night at the preset settings on a malt mill. Today I preheated my mash tun. Added 3.5 gal of 170F water and mixed in the grains. I stirred for only about 2 min until temp hit 155F. This ended up sitting for 1.5 hrs while I ran to the store. I then heated 3.5 gal to 170F while I drained off my first running. I dumped that 170F on the grain bed after and stirred it up real good then let sit for 20 min. I did a final batch of sparge water at 165F and another 3.5 gal. This third batch I stopped draining when I had 6 gal of wort. OG after boiling was 1.062 but only 4 gal of beer. OG should have been 1.060 with 5 gal of beer. I did lose a bit when siphoning but not that much. I was thinking I should have kept sparging and ran off another gal or so from that third sparge and also try adjusting for more crush of the grain maybe? I used this exact same method last week and had to add some top off water to hit my OG with just over 4.5 gal of beer. So it seems I actually got worse? What should I do to get better at this? Anything I am doing that is just wrong or bad?