Anything narrower makes it a nightmare to put on a chainguide. the 128mm is super easy and the chainline is great. I have a E13 on my 2005 V10 with a 128mm bottom bracket and the shifting is great and I can back pedal in every gear. The chainguide went on in minutes.
Make sure to get an E13 chainring. They are thinner and work better (less rubbing).