Auto win on 6 cards appears to be the same as 6 card Charlie rule.
I would use the strategy for 6 card Charlie from Wizard of Odds.
https://wizardofodds.com/games/black...ategy/charlie/
House edge for single deck double on 9, 10, 11 S17 with no DAS is .11% with the charlie rule probably an even game. The key would be can you get one more hand before shuffle.
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