the symptoms ain't making sense so I figured we might go back to some basics to try & get a handle on this. 15 BTDC is a good/reasonable start. You've likely already double checked your connections. I could see the MSD wreaking havoc on the dialback but if I am reading this right it is the other way around. Dont get a smart car, we WILL solve this! I see one every day in a companys' parking lot when I am out jogging & it caught my eye cuz it is so tiny (VG mileage I would assume). Do you have or can borrow a non dialback light for a quick repeat test?