I am very interested in the outcome of this. I THINK the oil filter bypass valve is the reason the light comes on and its normal. Probably a bit less oil goes through your remote mount but its still operating as intended and ok.

I think for the scope of engine oil passages pressure should still be higher upstream than down stream. As flow will take path of least resistance.

OK JMHO lots of thought and some looking into.... I think the oil filter bypass valve works 2 ways:
1. As a direct path pressure relief bypass. (At low flow and/or lower pressure)
2. As check valve with a differential pressure release across filter media. (at higher flow and/or higher backside pressures).

OR it provides for a minium of 17-19 psi differential to the filter media not sure exactly what is going on here. Its a parallel path of oil flow for sure with a checkvalve and restriction.....

Looking at it its a built like a check valve and a direct pressure release with a spring. It has differing piston face sizes exposed to the check valve sealing piston/operation. So that on initial exposure to flow it opens at about 17-19 psi but once flow stabilizes it will shut and stay shut until some larger differential and or check valve operation opens it due to plugged media. I can't remember I tried back of envelope calculation and wasn't sure of outcome on differential pressure release opening (I think it varies according to backpressure somehow and or flow properties). But to me it has 2 modes of bypass direct and differential checkvalve of sometype. In actual operation it will open at plugged media and it also won't restrict oil flow to main galleries at low oil flow. I think its a simple neat little mechanism operation hard to explain with text.

The oil pump pumps volume of oil depending on rpm. Oil pressure will rise as a restriction to oil flow downstream.

At idle the OP supplies enough volume of oil to build approx 20-35 psi at the oil gallery warm due to the size of bearing clearances and remainder of oil path vs the volume of oil supplied at RPM. --- Increase the RPM ( OP flow volume) and oil pressure goes up as restriction to flow downstream. But the oil gallery doesn't care where oil came from.

So here is what flow does oil pump is pumping and it bypasses filter because not enough backside pressure on bypass valve to hold it shut but the orifice size in bypass is small it still restricts flow so some oil will go to filter too. Enough oil volume is pumping to build 32 psi at gallery but filter head see less than 20 psi because not sure but maybe 10-19 psi of oil pressure flow is bypassing with the valve.

Now increase rpm more oil flow from the pump the orifice in the bypass valve is a restriction so pressure increases on flow to the filter head at that point. Now the filter head sees more than 20 psi and light goes out. Oil gallery sees more flow from bypass and filter so pressure reads >32 psi because downstream restrict stays the same.

Cold the orifice size in bypass valve is such that filter head sees more than 20 psi light is off. As it warms more oil can go through bypass valve oil orifice and filter head sees less than 20 psi. Cold the down stream of oil gallery path sizes/clearances build 60 psi of oil pressure.