You don't mess with air bleeds!!!!!!!!!!!!!! The carb has TWO ccts: idle & main cct. The idle air bleed is calibrated to 'finish' where the main air bleed starts fuel flowing for the main cct. You adjust by
changing fuel, not air.
The PCV
You had 'initial success'. Does that mean it DID idle ok, now it doesn't?? That could be adjustment of ign timing/carb or wiped cam lobes. The PCV will not work with low vac cams. If you can feel it vibrating at idle, in gear, it is not working. Need more info. Ign timing has a BIG impact on idle quality.
You get the idle timing correct first, before touching the carb. Below are some examples of what the correct idle timing can do....
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