At over 60 mph it felt like I was walking a tightrope- real unstable, I had to make constant tiny corrections for air gusts and the tiny bit of wind we had..
That's not normal! When you say corrections what exactly are you talking about?
I have to agree, though my experience is far less - I took the MSF beginners class, and my new bike is a Yamaha V-Star 650.
I got out on the highway pretty much immediately out of the lot to go home. Did about 55 all the way.
In my 1k miles of experience, 95% highway, it takes quite a gust to shove me over, and the faster I go the more stable I am.
Except for wind pressure on my legs, 75 is no problem.
As stated, when at speed I can pretty much take my hands off the bars, and other than slowing down from losing my throttle, I'm perfectly stable. Even more so than a bicycle because of the higher speeds.
Have that bike inspected by a QUALIFIED mechanic.
A very good idea.
Another thing I thought about is that I might be a bit heavy for the current suspension settings? I weigh around 260, and there's a section of road in town that has expansion joints at certain intervals where it feels like I'm bottoming out the suspension over every crack because of the frequency of hitting of crack. I used to have the same problem with that particular stretch of road with a pickup bed full of gravel where the truck would bounce up and down. It doesn't feel that way on the interstate, but I wonder if my suspension is too soft right now for me?
I'm not familiar with that bike, but I know that you'd be right around the weight limits for my 650, so it's possible.
RE: No vibration, wobble or shimmy but feels like a balancing act. Is that kind'a like when you first rode a bicycle and you were conscious of the need to balance the thing and used the handle bars to get upright and over corrected?
Very odd. When I'm at highway speeds, I feel like I could hang off of one end of the motorcycle and still not fall down. Very stable at those speeds.