318 - High Oil Pressure

Rotella T6 is a full synthetic. Any chance that it was used for break-in? Synthetics have been known to adversely effect ring seating and are not typically used for start-up of a rebuild. 10W40 synthetic won't cause this excess pressure.

As for the pressure coming out of the valve cover when the PCV is removed there will be a little, but this is a matter of: is it too much? Kinda hard to describe....but if it is coming out in a rapid stream, then that is excessive.

Sorry to hear about the break-in... that sucks.