Get your superheat right on a fixed meter. 20 degree drop is great but hard to get sometimes. If it is humid, it may be impossible to get. I have readouts for mine so easy to check. I've seen as low as 11 when the house has been open in humid weather to 22 in very dry weather. If your charge is right and drop low, if the house isn't a sauna, check blower speeds. Most installers leave cool tap on high regardless of whether it is right or not.