The factory charge is 1Kilogram. Of course, that's for R-12. Since you are using a hydrocarbon refrigerant, that information does not apply. My vague recollection is that hyrdrocarbons are much lighter, hence take a much smaller charge. I think that you are very badly overcharged. The low side pressure seems to indicate as much.

I think low high-side pressures are one characteristic of hydrocarbon refrigerants. There used to be an automotive a/c forum with an alternative refrigerants section. Such things were discussed there.

The compressor will cycle, but only if the evap gets cold enough that ice might begin to form. The pushbutton unit has an evap temperature sensor as one of its inputs.

- JimY