[Closed] Canyon Nerve XC shock setup

Looking for views on shock setup. I have recently built a bike around a 2010 Canyon Nerve XC frame. It has 120mm suspension from a Fox RP3 shock.

I couldn't find any info for setting air pressure so have done this as you would expect by measuring sag. I know this should be enough, but am interested to hear from any other owners what they set air pressure at and their weight for comparison.

I have only one minor gripe at the moment. I have rebound damping set to the slowest setting (max damping) and on resonably big hits the rebound is still too fast. Is this something I can do something about or will I need to have it tuned by a pro?

Thanks for your help.