"yellow rose" What do you disagree with ? The info I posted is fact all over the internet. It is what we have done for years.
And if the vacuum signal isn't high enough close the power valve circuit it runs rich. Same as if it is blown from a backfire. I have air fuel gauges hooked up I saw first hand the rich mixture with a 6.5 where a 3.5 was needed. If you are idling off the primaries with a large cam you are into transfer port to far.