Holy ****e! I just tried malt conditioning last weekend after having some slow recirculation in my HERMS. It was FANTASTIC!. I used a mill gap of 0.030" and used 2% by weight water mixed into the malt with about a 15 minute rest before crushing. I would HIGHLY recommend trying this!! I had around 93% conversion efficiency, which is near my highest achieved, AND I had excellent recirculation. I think I might try to go to 0.025" mill gap and see if I can get a little better conversion efficiency.