Possibly all the plumbing for the remote
oil filters produces lots of back-pressure due to the high volume pump. Are you measuring the pressure before the plumbing, or at engine entrance (after the filters and plumbing)? Very high
oil pressure can be a bad thing. If the pressure is caused by all the resistance in the hoses and so forth it could be reduced by going to a 5W-30
synthetic.
Just my $0.02.
Bob