For roulette which has 3 betting options... Most of the time I bet on 2 of these option including the option that has the value of 14x. Once that 14x hit, I will continue to bet on it for 3 more rounds (at most). After that, I'll refrain on betting with the 14x and just place a single bet. After at least 6 rounds, I'll add the 14x again to my bets.

It works for me, however it is not alwayrs reliable.