Sounds like both stages are very badly undercharged.

1st stage with R507 should be at ~160 psig @23C

2nd stage only has enough charge to produce liquid to cool the CPEV head? Ha! that's not much at all.

The good news is that it seems the leak is big enough, maybe it was made bigger by running it? so that the performance has seriously degraded since your first post. Maybe your HVAC guy can find that leak? That's the first thing to tell him, you have leaks on both stages, no point in going further until those are fixed.