I haven’t check head bearings, but will put it on the list. I did not balance them because I figured there was no point being knobbies, but I can try to see if that helps. The bike just rolled over 900 miles. I’ve put just over 300 of those miles on it since I bought it last month. It is a 2008 that sat for a long time. In the 300 miles I’ve put on it, I’ve noticed that it was a bit twitchy compared to everything else that I’ve ridden (lots of sport bikes, cruisers, my Vstrom, vintage street bikes, etc). Maybe these tires just amplify whatever issue is there. Maybe suspension geometry? The fork caps are right at the top of the top triple. Maybe the forks need to slide up in the triple clamps a bit?