Very interesting your idea to increase the velocity and the dynamics in that way.
I too find natural to accelerate after the first line, but you do it with more conviction and the effect is very good.
The instrumental suite can be bettered, as for all of us here..... but IMHO you have a very valid
conception of this piece.

Attention! There are about 100 Sonata fascinating as this......
> I can't believe Scarlatti wrote all that without losing his mind.
In fact, the biographer Roberto Pagano write about his obsession (but in that court,
with the king that cries to imitate the vocalist Farinelli). I like to search of this obsessive
mood in some his slow Sonatas, often amazing, IMHO.
> Does anyone know of other keyboard music he composed?
555 Sonatas (I recorded the K555 in the last weeks: wonderful Sonata).
The "Essercizi" being only the London edition of some Sonatas. Many scores were saved
by Farinelli.
> Some multi-movement pieces?
No,sir.
S.