I need people to test this method. Use an E/C. I like red/black. The trouble with differential staking is that one side can get out of kilter with the other. i try to overcome this by having column A which reads RRRBBBRRRBBBRRRBBB and obviously column B which is the opposite. I use +1/-1. Bet the difference between the 2 columns and no bet when they are balanced It does not require a massive bankroll nor do stakes spiral out of control.
Good luck.