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I think the idle, in gear, should be about 750 rpm, definitely not 900. If you are looking at the tachometer, it isn't that accurate visually. a scanner should be connected to get an accurate reading. A little vibration at idle is not abnormal. But you might try adjusting the engine mounts to eliminate it.
Overcharging could be one issue, but not likely. Sounds more like your compressor clutch is starting to freeze-up. U might wanna try adding some compressor oil in your system, although I believe most rifrigerants do have that as an additive already. Another posibility is that you have a bad pressure switch. There is a switch that will adjust your rpm accordingly when the AC is turned off or on. It is usually located along the lines of the AC system. Good luck!