[jchcollins]

PSA traditionally has placed corners above everything else. Everything is tightening up these days, but they are going to be more apt to say a 65/35 card with perfect corners is a PSA 7 than a 50/50 centered card with maybe borderline corner wear for the grade. SGC used to be more lenient as well - and a place where mildly O/C cards could go to get a fair shake, but not anymore. I've seen cards graded recently by SGC get 5's or 5.5's due to centering that would have been 7's with PSA. Some of this I think is attributable to new graders, or those who simply don't know how to measure centering properly. 70/30 shouldn't get the same penalty as 85/15. And some sets have to be measured out because of thickness differences in the borders when compared to other sets. '67 Topps is an example of that. Even a little bit o/c might be judged as really bad at first, because the borders were smaller than other Topps sets of the era.