the disks were fine 2 years ago, which is when the problem first occurred.
replacment bolts are on my wishlist of things 
I have titanium rocker cover bolts to fit already as the originals get furry every winter
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If its fine until you reach a certain speed then starts shaking the bars it points to a front wheel out of balance.
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Firstly what do you mean by high speed? above 110mph or above 50mph or?
But I agree with Royston and I would want the wheel rebalanced first before any other investigation. - if they do it on a machine it balances axially and radially so will allow for any disc imbalance.
True that the rear shocks are unlikely to have any useful damping by 30k and as the rear spring is too high a rate .it is possible that the springs are now entirely overpowering the dampers but while that may worsen any oscillation in the frame i cant see it causing it
over 100 is progressively worse.
the front wheel was balanced twice around time the problem started, once before bearings changed and once after, on the old wheels.
most likely balanced again on new wheels but I wasn’t there when they were swapped over, the rear has been changed since at my usual tyre place and balanced then.
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