I also do a single decoction for my Bo Pils similar to Dfhar. I do full volume BIAB, short protien rest, direct heat raise to 150 for 15 min, drain a little over half liquid into cooler to maintain at 150, boil whole mash for 30 min, cool mash down to 160-165, return liquid, mash at 155 for 30 min. I also like to add all my flavor and aroma Saaz hops to the liquid drain off in cooler.