[12Ounce]

You will actually get better cooling if the refrigerant is a bit low. If the compressor never falls out due to inlet side low pressure then you are OK ... of course there's nothing "wrong" with toppiing it up ... just don't expect that to iimprove performance. It will keep you further away from leak issues, of course.

BTW, are you sure the compressor is never falling out?

If you have had water dam up inside the drain path, there's a good change you've got some "growth" issues on the evap coil. Have you had a chance to inspect and clean it?

There's a belly cover that's removable. Best to disconnect the hoses from the heater coil and drop it with the cover. Beware of, at least one, screw against the firewall ... I think I remember seven screws total .... but its been a few years.