There is no doubt about oil control freeing up HP. I accidentally had too much oil in my car last year. Couldn't figure out why my E.T. was varying so much. What was happening was, depending on how much I was spotting, (how long I was on the converter at high rpm), I was pumping more oil to the top end and there was less hitting the crank. I was getting .05-.07 variance in E.T. I went from 10 qts in the whole system to 7 1/2. Problem solved.
Anyone who doesn't think windage doesn't cause a problem should try to move their hand in water as fast as in air.
Curtis
P.S. not asking for tech. but what is your connection to Hendrick?