I did rotate the crank yes. Initially I used a brass spray nozzle with a 360 degree spray to it attached to a squirt bottle with a flexible hose to "wash" fully around the cylinder to try and get the B12 all the way around the piston and rings and let it soak all the way around with about 3 oz per cylinder. Then waited a few hours and rotated the crank and did it again. Eventually the carbon washed to the low side of the piston and would no longer rotate past TDC due to the carbon buildup, I could see the carbon on the borescope. I had to blow out the carbon to get the crank to rotate again after I sucked the B12 from the cylinders. The V6 configuration requires a bit of out of the box thinking due to the piston angle vs a straight up 4 cylinder configuration.
The last hours of my soak I filled each cylinder with 8 OZ of B12 to completely cover the entire piston at the bottom of the stroke for a couple hours before sucking it out and re-using it in another cylinder. Ended up with about 16 oz in the crankcase, I added a can of BG EPR to the engine along with the 16 oz of B12. Started the engine, let it warm up a bit and reved it up to 1500 and let it run for 20 min. then dropped the oil and put in the Valvoline Restore & Protect in a 5W-30 flavor. The first 40 miles after the soak and flush it consumed 1/4 Qt of oil, then completely stopped after that initial 1/4 Qt. I beat the heck out of the engine running it hard and to redline often and the control rings freed right up. Pulled the filter around 1200 miles and had plenty of carbon in that filter. New filter installed and have 2300 miles on it now and hasn't used a drop of oil since that first 40 miles, (was using 1 Qt every 400 miles). Every time the vehicle goes out it goes to redline and full throttle shifting thru the gears for at least 10 seconds or so once the oil is warmed up. Getting ready to change the oil with another round of VR&P soon, around the 2500-3000 mile mark I'm thinking.