Does penetration really matter on KO count?

Hi all. Let's say in a 6 deck game I meet my pivot point and then some early on (say 15% dealt so far). Is it any less significant than say hitting my pivot point 60 percent dealt into the shoe?

My understanding has always been that an unbalanced count such as the KO count is great because there is no need for a true count conversion and that penetration at certain counts doesn't matter. But for some reason I always have it in the back of my mind that the pivot point is more significant and holds more weight the deeper you are in the deck. Please help. I have the book somewhere, but can't find it (just moved).

Thanks.