You could argue that a 250 is relatively lower than a 267, but you would still be stupid to withhold it because it is not low compared to somebody who is typically matching into radiology. As noted in the OP, it would still be 12 points or roughly 1-2 standard deviations higher than the average.
It is certainly conceivable that a program director out there only cares about step 1 because in his or her experience, that has been the only predictor of success in his or her program. Overall, however, the proportion of those applicants reporting both steps has gone up over the past 10 years. At my current institution, the radiology program gets both step scores from about 3/4 of its applicants. Having 2 high scores to report is better than just 1.
USMLE is the only objective measure programs have to compare students from totally different schools. So sure, you may know of one PD out there who says withhold it, but you would then have to withhold it from 10 other programs who would like to see it.