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Usually adjust the idle with everything on, A/C and headlights and electric fans etc...
And by adjust the idle, I mean, set the power FC a high idle setting (900rpm or more) and adjust the incoming air at the iacv manually with a screw driver. This way the power FC has added a significant amount of incoming air electronically so that not everything you need to idle the car is coming from the iacv's manual bypass.
Now, when you turn off all your electronics, the idle sky rockets. But the power FC will now have headroom to adjust the idle down. Cycle the electronics a few times over the course of 20 minutes to allow the power FC to "learn" (it really does) how much air to pull or add when you load the engine with the A/C.
Make sure that when the A/C kicks on, the power FC actually knows. it has a separate box for A/C Idle and a little light that indicates when it knows the A/C is on. Just remember if the power FC is maxed out airflow wise when you kick on the A/C, it will have nothing extra to give the iacv, although it depends on the actual iacv as some have a reserved specific amount of airflow that is added when the A/C kicks on iirc, plus or minus the usual power FC adjustment.
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