If you can only double on 9, 10 and 11 how does that affect splitting lower pairs?

I’ve recently started playing blackjack for fun but am still trying to play an optimal strategy. The best game my casino (crown casino melbourne) offers is H17, no surrender, DAS allowed and only doubling on 9, 10 or 11. Rules aren’t great for edge but that’s what I have on offer.

The chart I’m following is a blackjackapprenticeship one. Since I can’t double down on these low cards after hitting an ace, does it change the splitting strategy for the lower pairs?

Also a super quick question about the chart, it says to deviate at certain true counts. I know what true count is, but for example it says with a 16 against a 9 you should deviate at 4+ true count. Does this mean to deviate to a stand instead of a hit? And with a 10 against a 10 for example, it says to deviate at 4+ as well, does that mean deviate to a double instead of a hit? Thankyou for any help.

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