There's only two things that equate to holding power, 1) pressure 2) surface area of friction material.
To the OP - The reason I asked who's tuning is mainly because bad tuning can cause a variety of problems in a transmision ( see if everyday..Not saying yours is bad Tony, ruled out when i heard you tuned it) which leads the belief of builder error. Sure you didnt knick something going in ? I personally don't think you at the power level of worrying about how to make an allision live because many people beyond what you are pushing are'nt having issues with less product inside