Here is the graph that Jim send me, on first glance the difference is not big but if you look at the scale you will see that the lower treble area (peaking at around 4.8khz) is reduced by around 5db, from 1.5khz to 5khz is a lot more linear (still has boost though), the side effect of that is removing a big chunk of energy in the upper treble (centered at around 15khz).
I told him try to lower that peak at 11khz, he said ok, after that he wrote that his engineer was able to remove that peak but the end result was not good (i assume that the damping applied took out a lot of the FR before and after that peak) so he decided to leave the 11khz untouched for that reason.
Now i am not sure if he will make a new version of that earphone or not (our communication is not ideal) but as far as i know the last thing he told me was that it will use better treble tuning in the future models from the same line of hybrids.
If he make a new version of the F3 with that tuning it will be with different name (i told him to change the name so the people will know what kind of tuned earphone they will get) like mk2 or V2, something like that. We will see.
EDIT - look at the driver matching under 3khz, amazing