Couple questions:
1. Are you running Chameleon RC5? What version? Do you have CStates enabled and PStates disabled? Do you use DropSSDT=yes and your own SSDT's or DropSSDT=No?
2. What MAC model are you using? You might want to try few diff matching your system or create your own model to match exactly with your HW (I am using 11,1 and it had major impact on my geekbench. With i920 I get 14780 ... so you should certainly see more on your system. PS NPM enables turbo so this could also impact your score.

I have no experience with iAtkos S3 V2 and used vanila DVD to install, so may be who does have knowledge can comment.