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Octane is only an measure of the fuel's ability to resist knock (pre-ignition). Valvtronic is a throttling system and only changes the airflow in a direct injected engine.
If these engine malfunctions are truly related to the injectors, which seems to be the case at least some of the time, then it has to do with gas quality, not octane. If you search these forums you'll see many have had success with Chevron Techron additive. It doesn't boost octant but it apparently keeps these sensitive injectors clean. I've never had issues but I started using it every 3000 miles or so. BMW even sells Techron under the BMW label, but you can tell it's Techron by the shape of the bottle.
These modern engines will dial back spark timing and boost to avoid detonation, so using an occasional low octane tank isn't a problem, you just lose power.
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