Bob - after reading your post, my first thought was like Roscoe's, call the tech guys.
My system is the 2-quart model. I run 20 psi air pressure charge and get a good and quick oiling before starting engine, up to about 30 psi
oil pressure.
Follow the same procedue, pump up to about 50 psi, and then bleed down to 20 or a little less. My guess is the 7psi is not enough to pump 3 quarts under pressure.
Make sure the cylinder is empty before you start playing with the air pressure.
This might work for you. It does on my 2 quart system. Let me know.
Lynn