PCM reads false rich condition and substracts fuel. That`s why you got lean condition at idle.
You can try to play with 02 controls. Most of the 02 tables use only the first cell at idle.
If that not help, make it pig reach at idle so when the pcm starts removing fuel at CL you get a reasonable afr mixture.
As a last resort run open loop at idle.
The best strategy is to tune idle VE in open loop and than start playing with 02 settings.
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