The main chamber is for ride height, so you pretty much run whatever pressure gets you the ride height you need. Once you get the ride height set, don't touch it again, should be good. Evol chamber, going to have to experiment with that one. I would say try 200 and adjust from there. To stiff, remove pressure, if you are bottoming hard, add pressure. I would even keep reducing pressure in the Evol chamber until you bottom, then you know what the min pressure is you can run. Evol's take a lot of experimenting to get what you want, I probably spent more time tuning the Evol's on my 450R then all the other shocks I have ever owned combined. I would go out and ride a test loop and after the loop, make one change and ride the loop again, just takes a awhile to get them dialed in since they are so adjustable.
Doug