Mayor, I'm still confused on this one. I've looked up a dozen reputable sources and they all seem to say to play more than one hand only when you have an advantage. Why bet more than minimum when the house has the advantage? Can you explain please.
For multiple decks; Don S analyzed this rec./s that you play one hand when heads up and two when you are not alone. The reason is when alone you eat more cards in the high counts; wheras with one other playe the added hand doesnt have as much of an impact on the number of rounds that you will play. You can read his analysis in BJ Attack.
BTW - my favorite move is to spread to multiple hands when I am sure that its the last round; its a great move when heads up.