I have to agree with others, its the riding position and body. Maybe you could get a friend to film take photos to see how you are sitting on the bike. With the pictures it could high light your stance the same way as when you sit at work in a good chair, the spine should be in a s position. If you can improve your core, planks. Then as mentioned the way forward is to seat with no weight on the bars, using your stomach muscles to pull your body up straight. I have driven to Italy on the 916 and covered over 40k in the ten years ownership. It is hard on city traffic but then it was never meant for. Hopefully you can work on it. Vinnychoff
