My totally standard Basic has spent most of its life on Enduro 4s and then Tourances. Living in Germany at the time I bought it new, I was able to indulge in the occasional forearm building 170 km/h max out (once run in, of course) and on those tyres, I've never experienced any bad behaviour at Vmax. I've not tried TKCs, so I can only comment by ommission, if you see what I mean.
I was interested in your comment re. fuel starvation. A couple of times during the occasional Vmax autobahn run, I did experience fuel starvation like symptoms (on what was then a nearly new bike) when running less than half a tank (but comfortably above reserve) and I put it down to a possible vacuum effect on the standard Basic (aka R80ST) tank at over 100mph (and paranoid thoughts of the pots partially nipping up have not been proven by all the miles I've piled on since). The starvation effect went away after slowing down. Certainly, I've never experienced those symptoms at normal road speeds.