Where is the pressure relief valve? If it is accessible, might be worth taking it apart, make sure it is assembled properly, clean, correct spring, etc.
I don't think the relief valve is stuck shut. It appears to be working or the pressure would probably be even higher, especially when cold. Usually the first thing to happen is the filter will blow, but I have seen the pump drive twist off, depending on the design of the engine.
Don't see the filter being able to cause high pressure. Depending on the engine design, some need to have an anti-drain down valve. I have seen those fail, or had the wrong filter, that would cause low pressure on cold start up until the system could refill and pressure up. Most (if not all) filters have an internal bypass, as do some engines. This allows oil to bypass the filter if it were left beyond it's useful life, or brought to high RPM when cold.
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