There are many issues to talk about in this thread…
I am guessing pressure testing with Nitrogen and utilizing a good micron gauge is out of the question?
I doubt very seriously you are hearing air gurgling. What you are hearing is the fact that the liquid line is not a full column of liquid refrigerant.
This is probably due to air that is being trapped in the condenser/moisture freezing at the metering device. Easy to tell, fluctuating pressures, high head, high sub-cooling...
Typically head is high because you are reading more than one compound, instead of reading just the refrigerant pressure you are reading refrigerant + air + moisture…it’s a false reading.
This in turns jacks up your sub cooling number to some ridiculous levels, like 30/40 degree’s.
Although I am assuming this is a side job you still should be practicing proper refrigeration techniques.
Get rid of the refrigerant, add liquid line dryer, pressure test with Nitrogen, evacuate with a Micron gauge, confirm airflow, set charge accordingly (by superheat with a piston, by sub cooling with TXV)
Slow down, do it right and stop doing side work…especially for family!
Live each day like it is your last, for one day you will be right!