Can’t be 100% certain, but fairly confident that the drivers I mentioned were on the stickier prime tire.
Also, an update on my attempt to optimize my 125 for tighter tracks - changing the coil and spinning the engine to death - didn’t help.
For a better context of the situation with these “tight” tracks and the effect they have on what is normally perceived as the ‘normal delta’ between classes - the very fastest I’ve ever heard of a shifter, of any type, going at my local ‘tight’ track is 41.5’ish. The KA100 44.10. So barely over a 2.6 second difference between KA100 and a shifter of any configuration.
What that makes clear to me is that the “faster” classes make the greatest gains over ‘slower’ classes in the sections of the track where the top end power can be used and where a less powerful engine would finally tap-out. If a track doesn’t have many of those type of sections, then there’s less places for the ‘faster’ classes to make themselves standout.