VW Oil Pressure Fix

I rebuilt my Type 1 VW engine and soon found I was loosing oil pressure. I was down to 7 PSI at hot engine idle at 1000 RPM. It ran fine. I tried different oils and recently replaced the filter pump with a stock 26mm pump + full flow set up. I had already tried different springs on my oil relief system to no avail. Today I found something that made a difference.....