We had some cooler weather this morning and managed to get the booster online (for now).

With just the high stage running (fully loaded) we had

CW inlet T = 75F
CW outlet T = 81F
Refrigerant inlet T = 133F
Refrigerant inlet P = 204psig
Refrigerant outlet T = 89F
Refrigerant outlet Sat T = 94F
Refrigerant outlet P = 193psig

We then unload the high stage some and started the booster. With everything loaded back up as much as we could the numbers were

CW inlet T = 76F
CW outlet T = 86F
Refrigerant inlet T = 157F
Refrigerant inlet P = 237psig
Refrigerant outlet T = 98F
Refrigerant outlet Sat T = 102F
Refrigerant outlet P = 222psig

This is with both compressors running and satisfied. When the ambient temp goes up today and we run into our "normal" problem, I will take another set of measurements.

I did notice that since we moved the levels around and loaded the high stage fully, the level in the economizer is very low and still no level in the HP receiver. This is more what I am used to seeing, but based on RANGER1's comments, I am wondering if still more Ps wouldn't help.