I was running methanol. At 13/1 and went from a 6m to the digital 7. No gain. A big part of it is plug gap. If you think you are on the edge try different gaps, from as tight as .025 to .045 and see how the car reacts.
My digital 7 was a dinosaur, and one of the first built which were potted with resin and impossible to fix in a reasonable amount of time.