Now I think I have the timing Sussed I am still having a issue with rich idle.. I cannot get idle below around 10.8-11.2 AFR. It is definitely rich and a bit smokey like this but if I try and go down even a click on the idle mix it starts stumbling and stalls. It is like the injectors stop? Is this a common problem for big injectors on idle. I have 1000 cc secondary and primary with microtech ltx-12. Should I be able to get better cleaner idle with this or do I need to use some tricks? How much advance can I add in at idle before it's a problem. I know this will help but maybe only a bit. It had around 15 degrees advance before from static and idle was still rich.
Can I close the firing gap on the plugs up?
Raise or lower fuel pressure?
Anything else anyone can suggest.

Thank you
Lee