Before you charged the unit, did you evacuate the system, did you use a vacuum meter and how low were you able to measure the microns before charging it up?
Did you replace the bullet type filter stainer?
Those answers affect the outcome of your unit.
115 F is almost the upper limit as a discharge temp so I am thinking, there could be air left on the system and the filter strainer could be a little bit clogged that is why the suction pressure
is just 60 psi.
Do you have the port to measure the discharge pressure?
If the unit would trip off on a freezing evaporator
coil, it should indicate an alarm if there is a digital display at the front of the unit.
By the way, where did you get the 49F reading inside? Was it the output air of the unit?
If it is then it is just fine.
Now, to test if the anti freeze is the one triggering the condenser to stop, then you can temporarily remove it from the copper pipe where it is inserted. You have to remove the stainless clip first and please do not pull from the wires of the sensor.
Leave it off the copper tube and observe if it would still cut out or continue to run.
In some models I have seen, the condenser fan is dual speed and the speed is controlled by a temperature sensor located in the condenser coil. If the ambient is cold, it would run the low speed and if it is warm, it would use the high speed of the condenser fan.
Double check the capacitor of the fan too, it could also be leaky that would contribute for the slowing down in case you have a single speed motor.