Theese track days are useful for me to see the behaviour of the bike after my modification.
After replacing brake disks and shock absorber, I spent a day in Magione Circuit (central Italy, exatcly in the middle between Firenze and Roma) to have some idea, and to study the behaviour of Dual-CBS in limit situation.
Well, the result was quite good: the new mono (FG Gubellini) raises up the bike sensibly, and it turns faster and with more accuracy and "lightness"
The new disks have more "biting effect" at the initial pressur at hand lever, but (obviously) the Dual-CBS has several problem in brake managing on track; furthermore, the absolute power is limited, especially thinking about the big mass
and heavy power 
of the XX.
I tried to run... how can I say
... "fluid, soft", without violent brakings and I must admit that XX could be very funny even in circuit (I've been attending racetracks for 12 years, and I'm used to have lighter bikes, in my hands...)
Here some pics...
Before the battle...
the "Pilot"
In action (photo by courtesy of my girlfriend)
please note the garter
An Idiot on an XX
sparksss !!!
The suspensions worked really well, and the wear and tear on tyres was good and regular; GOOD JOB !!
And last but not least... little satisfaction
(especially if we consider the greater height of bike due to the FG mono)
Very soon... the new experience in Adria circuit, withe the brand new braking system !!
... let alone scraped his knees... 
