Oops, I kinda forgot this thread existed.
OCP mod should be straight forward copy-cat of 8800GT/GTS/GS OCP. The caps aren't placed identically but they're there. You might want to confirm the resistance of the caps is similar to that in the linked guide. What comes to vDD mod - try it from pad B-to-ground (VR @ 20x the stock resistance).

btw, did you try the reverse mods (in post #73)?