I understand your point. What I am trying to get across (Im not doing a good job) is that unless someone here is running the same sled with simular miles with the same turbo kit at the the same boost with the same helix angle and the same gearing on the same track at the same altitude. All bets are off. There are so many variables that this sort of advise is pure speculation. There is no better pool of experienced people than here on SW. However with clutching I think you need a box full of springs and helix on a hillside along with someone who knows how they all work together.
This is the time intensive process that I am and probably other are in the middle of. I did'nt mean to let my stupid side show, I was just trying to share my frustrated opinion.
Edit: After lunch, decaf is a good rule of thumb.