OK went back and reread this thread. First I missed Robert's mention of making a second slot for the dist. Yes that would have the same effect as moving the shutter wheel on the shaft.
But I think we lost track of the original problem by going down the phasing rabbit hole.
8t would help if you just had one thread about this just to keep information together rather than trying to figure out which thread has what info.

So what symptoms are you having? Not what you think it means but what is fact.that's not to be mean or rude but to keep things simple.

So far I gather that ms isn't happy with a degree spec. But the question is what does this spec measure?