Sorry I haven't responded...been out of town. When I was having trouble with 2-3 flaring and 3-4 flaring, the 3-4 flare went away when I had the vacuum modulator replaced due to a small tear in the bladder. I think proper adjustment and checking for a vacuum leak may help you. If you really want to get good information on your situation, private message "Joe P" at behind the Star in North Carolina or I think Gilly's screen name is "Gillybenztech" at Zimbrick European of Madison, WI. They were very helpful and offered great information to help me.
'86 Alfa Romeo Spider
'84 Harley Davidson FLH"X"
'70 FJ40 Land Cruiser (basket case)