Sorry, to clarify what I'm saying. You're tuning as lean as possible without knocking, then scaling back for a little safety blanket. I'm just wondering whether that '12:1' AFR saftey margin is being applied to the baseline tune.
If I'm remembering DI correctly, you can run a leaner mixture. So while 12:1 remains a good reccommendation for standard SI engines, theoretically you're not taking advantage of the DI technology. I'm not a DI expert by any means, I'm just wondering if anything will be approached differently with this engine technology.