Best sim???

I've noticed that with my modified version of basic strategy, I seem to win just as often with high negative counts as with high positive counts....and sometimes even more. I'm wanting to try a sim that provides the opportunity to offer progressive bets with both higher neg and pos counts--this could even vary, for instance, higher bets on neg4 than on pos4, etc.

The thought has struck me that I may be able to gobble up more winnings by devising a strategy to take advantage of high neg counts as well as high positive ones. (As a matter of fact, I'm amazed at how much I often end up losing when betting more with higher positive counts!@!)

Any recommendations?