Had the bike in for a rear tire replacement today and talked to the service manager and the lead technician about the issue. Both are long-time Yamahanians that believe the problem will pass as they've experienced this on other Yamaha models. Their recommended short term approach is to go into neutral with the bike still moving rather than at a stand still. While this does have a positive effect, it has no effect on my need for N once stopped so I'll continue to look forward to getting past this if it is a growing pain. Not a solution, I know... But in several years they've never steered me wrong on a single thing.
I appreciate the suggestions of line bleeding, but they said it wouldn't have an effect and would be pleased to do it at my request if the problem persists. I'm good with that for now. The shifter is spot on for me.
When I first took notice of the narrowness I was writing it off to not having a good feel for a pair of new boots, but after I rode with my more pedestrian boots (which have outstanding feel), it was clear that N was tight.
I'll follow up with any changes.