OK after looking at my RS1 I decided not to do this modification. The Vsync is on the DD PWB card attached to the optical block assembly and all boards are shielded with metal cans so I would have to completely remove the optical block assembly just to tap the vsync. The cables that attach to it are all taped down with conductive tape to the metal cans. Just seems like to much risk to make this mode and then I would have a cable carrying RF noise back into the projector subjecting it to ESD as well. Kind of crazy to take the risk. Plus I have issues with the polarization of the glasses and the JVC which gives me a dark image. I would need a new screen to fix that.
So I think I may try one of the short throw DLP projectors or even the longer throw Acer. I could move it a little closer to the screen so it's not right on top of me although the image would be smaller. Just seems like an easier option and gives me a very bright 3D image and no flicker.