Here in Va today its 91 degrees and 61RH at 2:45 in the afternoon. Its right at 100 degrees in my attic where the the airhandler and R6 flex duct is located.

Temp drop across the coil is return 73 and supply plenum 57= 16 degree drop

Inside the thermostat is set on 72 degrees. The AC has run for 6hrs 45 minutes so far since midnight.

Register air closest to the airhandler is 59 degrees

Register air farthest from the airhandler is 61 degrees

Inside RH is 38

Sound like the new system is performing SAT??