[turbo6bar]

A clogged orifice tube or restriction will create high pressures on the high and low pressure on the low side.

IIRC, non-condensibles in the system will show up via fluctuations in pressure as the moisture moves through the system and changes physical state. One check is via temp-pressure curves. Let the system sit and allow temperature of the system to stabilize. Check temperature of a refrigerant line and refer to temp-pressure chart of the refrigerant. If you have moisture, the pressure will read higher.

Purge with nitrogen and vacuum. You shouldn't have much moisture with a nitrogen purge. You can triple purge as an extra measure.

Personally, I think you have a restriction, perhaps in the orifice.
jurgen