Many things can affect the difference of temps. Not enough freon, air flow too much or not enough, A leak in the duct system, dirty coils, bad compressor. Compressor not running long enough. Outdoor ambient and amount of time running. Outdoor fan speed. I could probably find several more.

Typically, you should see a 30 degree rise over ambient. If your system is efficient, the difference may be 10 degrees, but I would not expect that to be the case. That would suggest the outdoor coil was way bigger than originally installed. For example a 60 - 72,000 Btu condenser coil with a 4 ton compressor.

I would compare the pressures if this is what you measure. Pressures tell a better story about how the system is working.

A typical split temperature is 20 degrees measured at just before the evaporator coil versus just after the coil. Humidity plays a big role in the split reading. High humidity will drop the split temp because the evap coil is using energy to condense out the water vapor which takes away from cooling capacity.