Roywil, looks like you are right again. The Wong index number I quoted was his multi-deck number.However in Appendix E his
expected value chart shows splitting in the SD, H17,DAS game to be the most advantageous strategy.
Stand -.187;
Split(noDAS) -193;
Split(DAS)-.186.
The 1-deck basic strategy web sites of the Wizard, Ken Smith, and BJ Math all say the same, namely split if dealer hits 17 and DAS is allowed.
I could have saved some web surfing time if I had followed ET Fan's post and checked Griffin first.