What I'd like to know is how anyone knows they are working at all? I still have the OEM tires and rims on my 2013.. never balanced, no beads.. and as far as I can tell they are perfectly balanced.....I certainly feel no vibration at speeds up to 85 or so however I also know that my perception in this instance is not a good indication of fact. Do you have someone ride in the TT at 70mph and check for vibration?
Any decent tire shop should be able to balance lug centric wheels with an appropriate adapter.. then you know for sure it's balanced.
My point is that the 'seat of the pants' balancer is in no way an accurate measure of wheel balance...
p.s. I know a lot of motorcyclist that use dynabeads, imbalance in that situation can be easily noticed. I suspect they work fine, just wondering how people "know" they are working on a TT tire..