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Clearances are probably on the loose side. Also high volume isn't the same as high pressure. I use a high pressure spring in any modified engine. With 20-50 weight oil my cold pressure is 75-80 psi. Hot idle is 40 psi, 30 psi if it's been run hard. Hot pressure at 2000 rpm is 60-65 psi. Pressure is 5 psi lower when using thinner oils. Most stock Mopars run 45-50 psi at 2000 rpm hot and anything from 15-30 psi at hot idle.



My tired stock bearing/crank 440 ran 75-80psi cold with 15 or so at a 700rpm idle in gear. Any amount of throttle and the oil pressure would shoot right up, and that's with an original pump/spring pushing 10w-30 oil. Your HP spring and thicker oil doesn't seem to develop any more pressure than my tired stocker did. I later tried putting in a HV pump, and saw a small increase in pressure at idle, 5psi or so, with the biggest difference being it built a lot more pressure quickly with any amount of throttle.

You can't have pressure without volume. A high pressure relief spring will do nothing for the OP. All a high pressure spring does is raise the upper limit of oil pressure you will develop before the relief pops, and trust me, the relief is a hell of a lot higher than 8psi. What you need is more volume, and if you're already running the HV pump, about the only thing you can try is a thicker oil.

You can try the stiffer spring if you want, however I would bet it will gain you nothing.