[al lkosmal]

Try this.

1. Get the settings to the same state as above. I.E. close the idle valve, set the throttle to 2.2%. You should now be idling at 1500 RPM...
2. Adjust the throttle stop to lower the idle, but stop just as it starts to surge.
3. Instead of richening the mix......lean out the fuel map in the idle cells a bit and see if the surging is reduced.
Don't go too far, too fast....just lean it out a bit and see if the surging issue improves.

Are you logging?
regards,
al