I agree. In 6-deck, H17, double is 1-1.5% better than hitting, depending on the two-card holding. For S17, it is 2-2.5% better to hit. For two-deck, as you say, H17 basic strategy is to double. It can be up to 5% better than hitting. For S17, depending on the holding, doubling isn't even the right play.
The indices can't possibly be the same for ANY game. The discrepancies are simply too large in the expectations.
Don
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