I had a new goodman heat pump 410a 15 seer and air handler unit installed last week. The installer had overcharged it the first time and had to return to cool the compressor and remove coolant. I dont feel it is working as it should after research on the proper method to ensure the superheat and subcool are within range. I had called another tech to check his work and now this one states the TXV is stuck open and liquid is returning to the compressor. This is the head and suction pressure he reported 304/156 liquid line temp 96 degree and suction line temp 56. I did the math using the chart and came up with a superheat of 37 and subcool of 7. First, can someone help me with making sure Im correct with my numbers, and second will a small charge correct the issue or do I need to adjust the TXV?