Thank you both for your replies. I assumed, wrongly, that handguards on such wide bars would be sufficiently far away from my head to make little difference. But, you're right; without seeing the airflow, who knows what's going on. I'll play about with the spoilers although as my only reason for fitting handguards was to reduce wind chill on the hands, I may have to live with the buffeting. I don't have a tankbag (yet) but that's something I shall also try. Cheers.