I would be careful about this... Playing efficiency is best related to single or double-deck games. Betting/Playing correlations are primarily and more accurately suited for shoe-dealt games of 4 or more decks. In fact some of the highest PE's use level 2 or 3 counts. One of the differences by way of example is the comparison of Hi/Lo vs. Uston APC (or APM): the former is horrible at PE(and Ins) and excellant at BC, Uston's are much better at PE and Ins. while being of acceptable BC.
This being a bump, I'll keep it short.