Im not sure how you got these figures for IND & SA. Your starting point is wrong it seems.
As i said you have starting querring series IND & SA played
after January 2007. Since its obvious cricket knowledge that AUS legacy ended after the 2006/07.
If you do that you get via simple maths:
IndiaStarting from the 2007 Bangladesh tour - 2011 tour to SA. 9 out of 16 series wins.
S AfricaStarting from the 2007 home series vs PAK - 2011 series vs IND. 9 out of 15 series win
Plus even if you want to take out series wins vs BANG in which IND have played twice. That would carry them down to 7 out 14 series wins since 07.
While for S Africa, given they played BANG once. 8 out of 14 series. So technically SA would have a slightly better % series win rate since the decline of AUS. But for me i'm a still call it even since in head to head matches IND & SA have drawn series with each other in the last 2-3 years.