So Far, I've been able to get each bank of cylinders within 11 degrees of each other and a max spread of 25 degrees on all 6. I want to see the max spread to withink 10 degrees total if possible. I added a small 1/2" triangle of carbon to the coolest plenum and removed the same amount from the warmer plenum in attempt to balance them a bit. we will see how this does on the next test flight.