When to worry about engine noises?

I would also like to know what oil pump is used. If it is "just" a high volume, the pressure could be normal. Not all HV pumps are delivered with a high pressure spring.

Also, the camshaft and valve train could be responsible for a lot of the noise. These fast rate of lift cams are known for making noise, so again, this could be normal. Just too many unknown variables here to make a judgement, plus, it's not ours to make.

Lastly, were I looking for "more" oil pressure, I certainly would not do it with a different grade oil.