worked on a 1 year old walk-in cooler today. Two evaporators, R-22. Who ever installed it didnt bother to check TXV superheat. It was way off. So I atempted to adjust it properly. I have only had to adjust a couple in my shrt career as a tech and i seem to have the same problem every time. The superheat would go up and down from 20 down to 0. I made sure to wait 15 minutes between adjustments and I made 1/4 turns each time. I could not get the valve to quit hunting. Refrigerant charge was good. Anyone have any tips for adjusting a TXV?