I've previously run 971's on my first TDM. I really like the small amout of rake on the ends, makes for very comfy wrists.
I recently came upon a set of 30mm risers on here, and snaffled them up quick.
Fitted them at work the other day, and what a difference.
The issue with the 971 is they are low, so changes posture to more like a sports bike, but the risers have made a huge difference. Before was ok, now it's like riding your favourite bike from your favourite arm-chair.
I'd tried 756(or 755 cant remember) on current TDM, and although they are better than OE, the new setup is miles better...