I must admit that I am somewhat thrilled that Michelangeli for once seems to take chances here and the let out something of the beast he caged in control long time ago . Musically, what I like is that the top melody gets connected in this tempo in another way which I think makes sense. Also, it is well known that Scarlatti was a harpichord virtuoso so it is possible he played it this way too. But, a matter of taste of course and do not take this as a bad critique on your recording from my side as it is not. I have listened to your recording many times now and really like it.