When I shot the plates I made I used a speed graphic at F4 or what ever the widest aperture was. It usually was about a 4 min exposure, and I did use gp-2 to develop them, with no fixer, and two alcohol baths one at 70% and the other at 90+. the alcohol dips really bought up the colors . Those pfg-03 plates should work
here's a link that may help
He's been making these for years and he uses those plates
Good luck-It took me 3 years to something that came close to anything acceptable