Mild 318 misses at 3000rpm

No need for brass feeler gauges. A regular piece of paper is about .002" thick. Fold it over twice and there's your non-magnetic .008".

Also, rotor phasing has zero effect on ignition timing and you'd have to be so far off to effect running, it would almost have to be one full space off. The only thing bad rotor phasing will cause is spark scatter, and THAT might cause what you're experiencing, but I highly doubt it.

I agree with Oldschoocuda on this. I think your timing curve is too early.