I think you are confusing betting correlation with playing efficiency. The count (A-X)11123221-1-3 has a .6995 PE using the calculator on this site which would be written as .70 when written to 2 decimal places. You make compromises between betting efficiency and playing efficiency when you decide on a count unless you use a two count system chosen to allow you to play with both the best BC and the best PE.
Aces usually play low for most match ups. But counting them as 0 and adjusting individually per matchup for the ace side count will get you a better PE than always counting them the same for the same playing count.
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