ST: Starting with case of extreme clumps
I know nothing of shuffle tracking but let's assume a super shuffle tracker has succeeded in identifying an extremely clumped shoe with (all 2-6 + half 7,8,9) in one clump and all (T-A + half 7,8,9) in a second clump. Below are EVs for each clump for s17, double any 2 cards, NDAS, 1 split allowed any pair, bj pays 3:2, no surrender, full peek.
all (2-6) mixed with half (7,8,9) = [26 cards (1 deck), 156 cards (6 decks)]
single deck CD basic strat: -64.11%, CD best strat: +1.03%
single deck TD basic strat: -63.94
6 deck CD basic strat: -62.06%, CD best strat: +1.31%
6 deck TD basic strat: -62.06%
all T-A mixed with half (7,8,9) = [26 cards (1 deck), 156 cards (6 decks)]
single deck CD basic strat: +10.48%, CD best strat: +18.42% - ins +7.07%
single deck TD basic strat: +10.48% - ins +7.07%
6 deck CD basic strat: +10.05%, CD best strat: +17.62% - ins +6.60%
6 deck TD basic strat: +10.06% - ins +6.60%
Common sense observations:
1) If cards are clumped in +/- slugs using basic strategy or anything close to it would require extreme accuracy in identifying positive card clumps because misidentification could be really costly.
2) If shuffle tracking works then more decks is better. An extremely clumped single deck could pretty much be diluted in one shuffle. The same is true for a double deck if it is shuffled as a whole but if it is broken in half and each half shuffled separately then the extreme clumping might be preserved. It is the forced breaking up of a shoe in order to shuffle that would be most likely to preserve existing clumps.