#1. How much idling do you f**kin' do?
#2. Explain why you don't just turn the distributor for good idle, swap some springs, and run NO vacuum advance like so many hotrodders have done forever?
#3. Some of those articles (from what I can read, they're microscopic on my PC screen they way they're posted) say you want retard just off idle, but my question refers back to number 1 when I ask, why are you tuning your motor for a period of time when you're not using it?
If you REALLY want that much control over your timing, switch to EFI and be done with it. Chrysler tried every mechanical trick under the sun in the late '70's to do what you're trying to do (albeit for different gains), and eventually....computer control.
I ain't arguing any more. Can lead the blind to water....can't make 'em drink.
See? See what manifold vacuum advance did to your motor? I told ya bad stuff was gonna happen!!! (At least YOU know I'm kidding about that)