So, they didn't surprised me, told me that they don't know of anything more which can be done by them, that Triumph replied with "That's normal behaviour", so they try to figure out something else to test my bike, like try to "ride" it on a brake in those speeds to see if it does something, which is not the same as riding it on the road of course, but it eliminates the uneven road surface from the equation and therefore if the issue will manifest itself, it should be more obvious and based on that, they will have something to negotiate more for me from Triumph. I'm pretty sceptic about that, but what can I lose by trying, right?