from my field experience with goodman equipment...the fault is with the installer NOT removing the shraeders when installing. I highly doubt someone would waste a full tank of 22 at the price its going for right now. Heat makes rubber (IE. Seals) melt, which in turn causes a leak. At 8pm your lucky you got someone to come out at all. be thankful for what you have now. The gurgling on a non-TXV system is normal. the temp drop across the coils is lacking slightly but give the guy a break. newborn + working a full day + dealing with a call a 8 PM = he hasnt slept. he should have vacummed it down. but hey, ya got cold air.