A while back I posted about a possible reverse index for late surrender 8,8 vs. A. The rules were 1D H17 DAS LS but this may apply elsewhere. The reverse index is somewhere below zero. However, it looks like it is better to Hit rather than Surrender at low counts. There may be 1 or 2 counts where Surrender is preferred but probably best just to go with the Split >= index # and hit anything below.