I just done some quick maths. (well maybe quick for others)
IBPW = Airmass/AFR/IFR*1000 + offsets + spa. (I know Marcin, I havent fully proved it yet)
So we should be able to calculate your actual cylinder airmass at idle with the equation.
Cylinder airmass =(IBPW-offsets-spa)*IFR*Wideband AFR
Using your log we have
(1.770046-0.4711-0.030395/1000)*9.242188*12.3 = 0.144207498 G/cyl.
If others would like to check my equation that would be great. To me it shows you underestimating airmass at idle by a fair wack. (0.0312 g/cyl in your tune) So once the min pulsewidth issue is sorted you will be way lean.