I noticed exactly the same thing yesterday whilst on the motorway on my 690e. A slightly disturbing shimmy when accelerating between 80 and a ton. The heavier I accelerated the worse it got until I slacked off. Interestingly it doesn't happen every time and if I back off the throttle for a few seconds and then open it up again everything is fine.
Checked the obvious things and the only thing that stands out is that the front tyre, although not too badly worn, could do with reversing. The tyres are stock. Haven't checked out the head bearings yet but it's not likely to be the suspension as this is a completely new issue and I haven't touched the suspension for a while.
She's due a service once I get some money, so if I can't solve the problem I'll get the KTM dealer to take a look at it.
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