What I don't like that you did is putting silicone on the galley gaskets and the fasteners that hold them down. By putting silicone on the fasteners this may have caused them to not go in all the way which could cause them to back out and cause the erratic oil psi that you mention. Also, by putting silicone on the gaskets a piece of silicone could have finally broken off and is partially clogging the passage that feeds oil to the camshaft phasers and solenoids.
Looks like you may have to tear down the timing components for inspection. Sometimes reading live data isn't enough.
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Ford Diesel and Heavy Line Technician at your service. 
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