I think the lighter the bullet you use, the more advantage you will get from RL17 if that's the route you want to go. I wouldn't bother using it with the 200 gr bullets but hey, you could always try it. I dont have enough confidence in my chrony to completely rely on what it tells me. I just use it as a rough refeerence. I was getting about the same accuracy as the other powders and it might be a whole different story in your rifle.
I would recommend in starting at 80 gr with the 168's and working up. My guess is you'll see max beteen 86 and 90 gr. Becareful because it seems to spike quick with the E-Tips in the RUM. I would go in 1/2 gr increments from 85 on up.
I wouldn't have a clue where to start with the 200's. If you can get someone with quickload to help you, they could probably get you a starting point. Otherwise, I would start with maybe 77.