Corey:
I'll just say that course rating/slope is typically all I need for resistance to scoring... rarely I have seen a course where I'd disagree with the CR/S ratings... so yeah, for that, I truly believe one need not see the course - the raters from the local association have done your work for you!
I believe GD once did it purely on CR/S, but recently has moved to just having us do it subjectively. I am such a newbie though, I don't really know for sure. I just know that I'm a unique cat in that I do both types of ratings, so I know very well what goes into CR/S, so I just trust it myself. Given the issue is resistance to scoring for the scratch from the back tees, all I need is CR from those tees. S doesn't matter at all.
I also believe resistance to scoring is a valid category to have, btw. I wouldn't make it too important, but one out of ten categories seems ok to me.
TH