Just general information on oil systems, but the reason you get such high cold pressure is from shimming the relief spring. Shimming the spring only increases the high speed pressure, and has no effect on idle pressure. I would return that to the original position before something breaks or blows!
You may be onto something with the governor oiling. There may have been a restrictor in the old line or a fitting that got replaced. If the governor is free flowing oil through it, that would be a good place to start.
Same with the oil filter. I suspect that uses a 'bypass' filter where a small amount of oil is passed through the filter and dumps back to the crankcase. If it is, it will either have a small restriction in the line leading to the filter, in the filter housing, or inside the filter itself if it is a spin on.
An easy test would be to disconnect and plug the oil filter (only if it is a bypass filter) and the governor feed, one at a time, and do a test run to see if there is an improvement.
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