ROSE! I can`t believe u said that ! Forever the word on power valves , have been "half" of ur vacuum . I didn`t read all the posts, because I have a timing controlled fuel .inj. set up, but do read some to see what others are doing , regarding mixtures. Maybe I missed something .?????
Yep. That's what was always said, although some said half of idle and others half of cruise. Half of cruise was probaly closer, its still not a good rule of thumb. YR is right, give it what it wants.
It needs to go rich when the engine says. Graph of AFR to Load