LPG mixer Tuning with AFR gauge

[dom14]

Hey Guys,

I'm trying to tune the LPG system using Innovate MTX-L wideband AFR gauge.

The readings I've got for the existing LPG mixer tuning settings(Impco 300A mixer) is as below.

Idling AFR is 11.
Cruising AFR is around 15.5-16
Revving for power causes AFR to go as high as 17(thought it should get richer momentarily, but getting leaner instead).

I started adjusting the "POWER" screw to see if the AFR can be changed from 11 to 14 or so on idling, and obviously that screw is meant for AFR setting for power/cruising, not idling.

I started adjusting the "IDLING" screw(after removing the covering bolt as in the picture) to see if I can get the idling AFR to closer to 14.7 using that. Turning the idling screw clockwise did get the idling AFR to 14.

Am I going about this the right way?!
Should the idling AFR on LPG be around 11??!!

Engine is fully warmed up as I was doing the above tuning adjustments.

My target is to improve the LPG economy without pushing towards detonation.

Do I need to adjust the ignition timing along with the above mixer tuning?!

Thanks in advance for any tips, advice, etc.

Cheers
Dom

[dom14]

At WOT, AFR go pass 17.
I'm not sure if that's ok!!!