Mine is an exact clone of JK's CB20 system except I used all SS 10 gal kettles. Recirc is definitely the trickiest part. I recirc to 170 for a "mashout" and have played with several different settings from very slow to very fast. On my latest brew I drained nearly everything from the mash tun, heated to 170 and then pumped back up to the MLT and let it recirc for 30 minutes and it stabilized at 170 in both vessels. With the larger volumes it takes a long time to get to mashout temp. First brew on the system it took me 1 hr. Stirring the mash definitely helps efficiency but you have to be careful about getting too much grist in your BK. My latest trick is to line my MLT with a voile curtain ala BIAB. It helps keep the grist in my MLT and makes clean-up a lot easier.
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