I want to be a kick ass BJ player, what do I learn next?

Hello all. I have memorized the chart on when to hit, stand, double, and split and have had success using it. The question I ask to all "gurus" is "what do I learn next?" I think the next reasonable step is to learn a counting strategy. If I am correct in this assumption, does anyone have any suggestions on which strategy to learn? I have a pretty good head for math so a complicated strategy is ok if it is effective. If there is a simple yet effective strategy out there, that is ok also. My main concern is mastering the most effective strategy WITHOUT having the mentality of "Rain Man".

All help is welcomed and I thank you all in advance...

Carl