Unfortunately, Ron is right. The most correct procedure is to evacuate and recharge completely. And the odds are that the dye test will reveal a leak in the evaporator. And then the right thing to do is have that fixed. For >$1000.
Since this is the land of the free, however, you can choose to continue "tweaking" and "topping off" the freon amounts using low-pressure gauges, etc. This approach may not give you optimal cooling and will not make environmentalist friends, but it is your choice.
Gerald C
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