Ok so this is coming from someone who does pretty well when going to Atlantic City and has had a fair share of horrible days at the tables and amazing ones... my mind set is the same for GTA Online and AC: sit down with a buddy or two at a table and force the dealer to go bust. The secondary strategy is to help save the table, if that means sacrificing your own chips by taking a hit when you should stay, in order to prevent the dealer from hitting high (thusly, allowing for the card draw to be in the favor of your tablemates), so be it.