Re: poor handling at top speed
I run Extra thick "Flat Proof" Bell tubes that have sealant in them and my bike will top out @ 38MPH and has NO wiggle or wobble and no wheel balancing has been done on mine.
So this is a ????
I say just to cover all points I would go with non slimed tubes and see if it makes a difference, it does sound like a out of balance problem of some sort.
Hope you get it figured out soon, good luck.