Only raise with a spread of 7 or higher

The only way to get an edge over the casino is to raise your bet when you get cards that are at least 7 rankings apart. Of course you wont win as much but this is the best way to get an edge. Lets think about this for a second; The deck has 13 cards (A, 2, 3, 4, 5, 6, 7, 8, 9, 10, J, Q, K) If you get lower then a 7 card difference in ranking you shouldnt raise since the casino whould have a considerably higher edge over you. Besides a 4-6 card difference pays the same amount as the 7-11 spread.

When you have a difference of 7 cards between your hand you have about a 54% chance to win which gives you the edge. Your edge can go up to 85% when you have a spread of 11 rankings. You have a larger chance because there are7 cards that will make you win over the 6 cards that will make you lose. This is pretty simple to understand; when you have a spread of 7 or higher double, anyhting below that is a much higher risk to you

Of course the choice is yours and if you want to go for the big money with a lower spread than you can but I recomend that, if your actually going to do so, then do it with higher payouts with a 1 or 2 card spread.