:-D don't worry Richard I'm not having a brain melt down, I have to admit to a certain amount of Devils Advocate here, as you know I've had a number of six cylinder motors all of which performed perfectly well with single point set ups.
What started me down this line of thought was the relationship between dwell time and coil saturation and how various manufactures addressed the problem,as an aside while rooting around for information I found reference to dual point distributors for six cylinder engines unfortunately what they were fitted to wasn't recorded. As you mentioned in a previous post it's a common set up on V8's but I hadn't ever come across a six cylinder dual set up any idea what they were fitted to?
Pete