Kind of shocking (and disappointing) to me that, of the five responses you received, not one referenced the concept of the Floating Advantage. Frankly, I'm insulted!
In any event, the correct answer to your question (see p. 85 of BJA3), is that, because the SAME true count is worth more as you progress more deeply into the shoe, a TC of +3 in a 6-deck game, at the 4.25-4.50-deck level, is worth about 1.21% while that same true count at the top of the shoe is worth somewhat less. I can't tell you precisely how much less because, as you can see, our study didn't distinguish very much between various levels of penetration early on, and lumped all such counts from 0 to 4 decks into a single category (in this case, a 0.98% edge). That decision was based on space constraints and the fact that, in the beginning, the FA doesn't really manifest itself, and edges don't change meaningfully till much deeper into the shoe (as the article clearly discusses).
In any event, a ballpark estimate is that the TC of +3 at 230 cards is worth at least 0.25%-0.30% more than at the top, after only 20 cards. That's the answer you
should have gotten, but, as usual, it's very difficult to get a straight answer to a perfectly straight question on this (or any) site.
Don
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