Help me get the off-idle stumble out of my QF 750-AN Double Pumper

Ok, so without changing anything else, I put the 0.033" idle feed restrictors in the primary metering block only. This did basically remove the off-idle stumble, which makes the car a lot easier to drive.

It did, however, make the cruise in the 1200-2000 rpm range pig rich (11.5-12.3 AFR) I just wanted to see what would happen, so I went back down from 65 air bleeds to 71's. This is just on the edge of the stumbling coming back. The cruise air-fuel leaned slightly to 12.0-12.8.

I think the next step will be to put in the 0.032 idle feed restrictors (I bought 0.032, 0.033, 0.034) and see what that gets me.

I had actually tried bumping the timing long before, and strangely I had almost 40 degrees in it at idle and it would still start without drama. It didn't do much for this issue, though....but that was before I put the fuel pressure regulator on.