Why is it when I pan a dry mono guitar channel hard right or left...no crosstalk, no external processing, my Ozone correlation meter doesn't indicate +1 correlation?!  If I bring it back to 98% it starts to, but 100% seems like it's panned "too far". I get the same read out no matter the mono source (kick drum, snare, etc.)
 
I thought a mono signal would (by definition) always be +1 in a meter regardless of panning, which illustrates it's indeed mono.
 
I'm confused. 

A mono signal has no phase as such an can be position anywhere in the 180 degree stereo field AFAIK. I use VSL Powerpan for this sort of thing which is more visual than numbers. Perhaps you have discovered a bug.
 
 
 

not an expert but would first check Sonar / Preferences / Driver Settings, Panning Law.
I'm thinking perhaps it's a panning law..

Good call. I never realised Sonar controlled the pan law.

Makes sense. A correlation meter adds left and right to determine how similar or dissimilar they are. Is any signal 100% dissimilar to silence? I'd expect it to be very close to +1, however. It could come down to how the meter does its averaging, e.g. how big the window is.