At the risk of repeating my earlier summary I just want to be clear I'm NOT talking abouit the handlebar buzz at higher RPM's (that my bike also has). I assume that's 'normal' and can put up with it.
My bike has a distinctly noticeable VIBRATION (not buzz) at the 2500 and 3500rpm rev points, in ANY conditions (in/out of gear, road surface, stopped, rolling, etc).
It's solidly felt in the bars AND the seat (and I'm sitting on top of a gel padded seat).
I do appreciate all the comments, I just didn't want this thread to fill up with 'you are lugging the engine' or "buzzing is normal' comments when my situation is different.
As I noted the next step is for me to ride other bikes and FJR experienced folks to ride mine, empirically compare any differences.
On the other note, the 'howling noise from the front end', I did some testing over the weekend and I've concluded it's likely tire noise.
Not scientific but:
1. I never heard that noise until the last maybe 1000 miles. Bike has around 5500 on it so the OEM front tires will have wear they didn't have new
2. The noise is not proportional to speed. It's loudest at around 40mph and 60mph
3. It's heard only on certain surfaces. Dark blacktop is much quieter than 'gray' concrete. I hardly hear it at all on blacktop. I hear it loudly on concrete.
4. On 'lighter blacktop', the kind often found on highways, I hear the sound distinctly. However, and I kid you not, if I move to the center and ride along the 'oil strip' the noise all but disappears (at any road crown angle)
5. When I hear it loudly and the road transitions from concrete to blacktop and back to concrete the noise ceases immediately on entering the blacktop, and immediately restarts on entering the concrete
Definitely appears to be a road surface related effect.
I suppose the rougher concrete surface could be causing vibration to be transmitted to the wheel bearing or causing some other part of the front end to 'resonate' to cause that sound, but my money is on tire noise.
Guess I'll have more data to report when I get round to replacing the front OEM tire later down the line.