lean condition without lean condition under LPG...

[f.creek-ranch]

I ve installed a LPG from KME. Over 9ms injector timing I add 3ms fuel from stock injectors.
It runs fine and smooth, 12.5 afr over 3500 rpm and 14.7 - 13.8 in low rpm.
But the ANN tells it runs lean.
How can I get more tolerances to the O2?s to avoid engine light?

RT5.7 with 6.4cam wo MDS

I got the feeling it happens in idle conditions or coasting but need to log it with WB.
Maybe the VE Min table in NN is a way ?

[f.creek-ranch]

Seems to be an cold start problem after closed loop and idle conditions.