This might seem stupid, but I did this before, but.....
Check the order of your filters. I put the filters in the wrong containers (I put the 1micron before the 5micron) and I couldn't get any higher than 20psi.
I was fed up so bought a new set of filters even though the ones were quite new at the time and I then realised that they were in the wrong order.
My output instantly increased from 20psi to over 50psi.
Silly me!
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