I have been doing all grain batches and twice now my efficiency levels have been low both times I have increased the grain bill A simple grain bill and that batch sparging brewed a Kalsh beer and expected and OG of 46 ended up with A 20 i'm using 830 quarts igloo cooler for my tun did a calculation for my Sparge water and hit exact tested migraine with iodine after 60 minutes all was good Sparge and ended up with 7 gallons for a 5 gallon batch boiled down to 5 gallons I question is I'm concerned about my set up my cooler is more square and tall I have a Sankey keg that I have not touched and thinking about converting it into my tun I would like to use it as my brew kettle and may be reconfigured my igloo cooler I have two shaded pole motors low RPMs and a motor controller and thinking about putting two paddles and there to stur The mash and fly sparging what do you all think