I'm 5'7" and 12 st ish. I have an MRA screen, still trying to work out best angle.
I think Sharpie's right - the cure is to ride more. However, that wasn't possible at the time so I found a treatment -
TigerBalm (for them wot don't know - and I didn't - it's rub on deep heat stuff, cheap at Sainsbury's) applied liberally to the shoulders and neck, and paracetamol. That did the trick, especially coming home (Nairn - Carlisle - Cambridge)
(NB see 'what did you do with your Fazer')