It is important to play with basic strategy if you want the full RTP. There are many websites that let you put the game rules, for example "8 decks, S17, DAS, No Surrender, Peek" and see a basic strategy table accurate to those rules. These rules for instance have a low house edge of .47%. Remember that one general basic strategy table does not apply to all variants of the game, and you should read the rules for each. Good Luck!