I found those charts (and the way CVCX is set up when looking at the basic strategy) to be confusing as well. Wizard of Odds puts together a chart that should clear up all your confusion - at least for basic strategy.
https://wizardofodds.com/games/black...ategy/4-decks/
Edit: I've also memorized the different versions of basic strategy for the two types of shoe games (S17 and H17), but you may find it easier just to memorize the composite version. I believe Norm calls out in his book that implementing the S17 version over the H17 when playing a H17 game, you're losing like .005% edge. Which is only half a penny for every $100 bet. Your call whether that's worth anything to you. (Check those numbers, I could be off by a little bit).
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