I thought I'm gonna share some of my logging experiances.
I was feeling brave and had play with timing advence.
Running LPG without almost any knocking I decided to advence ignition timing so what I did was:
load 0-100 +2deg, load 120-140 +3deg, load 160 +2deg, load 180 more +1deg
done few runs on lpg and results are below.
Knocking still almost not existing so may be even more brave next time
First run:
AFR, coolant temp
timing advence, knock sum