As far as "Make 11 and double down" goes, there are two variations...
First scenario: you are dealt 12 to 19. You swap a card immediately to make 11.
Second scenario: you are dealt 3 to 10. Hit first, then swap to make 21.
For the second scenario, you miss out on the double-down, but win a LOT more often if you have a lot of cheat cards.
Also of note, with the new inventory system, you can set your "I" inventory panel to your cheat cards before you sit down...and use TAB to open and close it to see which cards you have while you are playing, before starting your swap. That way, you waste less time trying to swap the wrong suit.
I've been getting 40,000 per hour cheating (using this guide's methods) at blackjack lately.