I would note the total advance (mech+vac can) at the offending RPM where it "runs rough" then cap the can & bump up the timing to get the same amount of timing at that RPM & see if anything changes, otherwise there are cans that offer less adv but not sure where/how to search, Google or Rockauto maybe.
I’ve looked at different vacuum cans online and the lowest one I’ve been able to find adds 17 degrees which is more then what my current can adds.
I’m going to do some more trials with the timing settings, I just never really have the time to specially right now cause it’s the busy season at my job and I’m working 10 hour days 5 days a week and ok the weekends I hardly have enough time to do the things I need to do around the house and for my family.
I’ll get more time to mess with it this winter but untill then time is pretty much non existent lol
