Problems with A/C

Given that pressure is nearly equal to temperature in refridgerants,
25 on the low side is too low. Low pressure switch is what is stopping the compumper. Could be nature of the beast with a gas converted system since it doesn't know the gas has changed. Could be the fixed orifice tube is clogged too.
You can add enough gas to keep the low side above 32 and see where the high side goes to. A clean condenser and proper working fan will make a difference there. In the end what I've suggested puts the system charge back to where you started, ( seemingly overcharged ).