Questions:

1. What's the bankroll? You give a ROR but no bankroll.
2. If your player is at first base, does he reckon the other players' cards to his left before he plays his own hand?
3. What is the standard error? If you simulated 200 billion rounds, instead of 200 million, I suspect some of the differences might disappear.
4. In your first set of results, the very poor outcome playing with two counters doesn't make any sense to me. I think something is wrong there.

Don