Sorry if I'm being a bit thick but what tab do you need to go to on RTSS to be able to find the exe files to begin with? The launcher tab?
Edit: My bad I had basic rivatuner launched and not the statitcs server! Found out how to do it now
Edit2: Ok tried using Rivatuner(d3doverrider) to force vsync at 30fps and I'm still experience frame pacing issues. Every second like clockwork there is a slight judder. Really interested to see what other peoples settings are who aren't experiencing this judder. No matter what gfx settings I use, I still get it. I swore it was an engine issue and nothing to do with my end, but if that's the case, then everyone should be experiencing it. It's not bad by any means but definitely noticeable.