Condensation on the suction line at the compressor, roughly 15 minutes after startup is always a signal to me that the system is full.... considering you are on a warm summer's day. Gauge data are available usually but systems have different loads and environments which can change the normal pressure vs ambient temp data and I usually don't get everything working per the book. Sight gauges on receiver/dryers are a joke (opinion). One of the big variables is the location of the expansion valve vs condenser plumbing. New units not a problem but if you have a reason to disturb or change the EV getting it back in the right place, or the design of your replacement has a big effect on system performance....BTDT
Another variable is the location of the evaporator coil and EV. If you are in the shade when you setup your system, ambient temperature at the evaporator is much higher after you spend a day out in the sun working as is the heat load as a result of sun shine not only on the top of the cab but through the windows too.
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