Oil Pressure Too High

Fired my solid roller 416 Friday, and the oil pressure is about 70psi at idle. Whenever I rev it to over 2500 it goes up over 100psi!!! (on two different guages). The filter then of course leaks badly. I also tried a new Wix filter, same thing.

I am thinking I will have to drop the pan and go for a pump relief valve that may be sticking. New Melling hi volume. Is there anything else that could cause this? I see a plug behind the plate where the filter spins on Should that passage maybe be open? Thanks for advice in advance.
Mike Wingeier