Basically to win in RAMBO you have to use 3x or 4x, 3x requires you to have a 33% win rate to break even and 4x requires you to have a 25% win rate compare to lets say 2x which require you to have a 50% win rate just to break even its not worth it as having a 50%+ win rate is very unlikely. Personally i stick to 3x and it serves me well. Just a tip dont spend what you cant afford to lose in Rambo, Its risky you might win or lose everything so set a limit for yourself.