Condensing unit and compressor set system capacity. If evaporator is physically smaller than it should be for the compressor and condenser it is attached to, it will run lower suction pressures than normal. Might be okay during a good heat load but when the heat load falls off, the coil suction pressure drops to where the surface temp of the coil begins freezing the condensate.
I would also seek less intensive heat methods of cooking the evening meal during the summer months. Running an oven adds lots of heat to the house, and, depending on what's for supper, cooking can add a lot of moisture to the air as well, which the a/c system will spend some time removing, possibly far into the night.
Airflow should also be looked at, as well as the actual performance of the refrigeration system (superheat, subcooling, etc.). It's not enough to say "pressures look good" and hold a hand up to a vent near the furnace and say "air flow is good". These parameters should be measured.