I had a billet SC (early model), which I paid a motza for and never got happy with it. Worked with APT/Corey for a while with different metering rods and adjustments but always found that I couldn't get it to run well across the board. It was either too fat for slow tech work, or too lean for hard runs.
In regards to your idle issues. The squish clearance if excessive will do exactly that. I chased myself in circles until I was dizzy with intermittent issue idles. Measured squish at 2.8mm. After head work brought back to 1.25mm and compression adjusted and it idles like a sewing machine.
The only other thing that really impacts on my idle is the clutch drag. There is a bit there, and I set it so it only just ticks over with the clutch lever pulled, on a hot engine. Sometimes I need to give it a little blip to keep it going. In neutral it idles very nicely, low and slow.
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