Yup, that was definitely an old-school Guv story, right out of some lunatic's drug-addled nightmare.
I won't pretend to be as shocked as Andy. Constant exposure to your malevolence in my formative years have rendered me far more resistant to gory displays and images from the netherworld, to say nothing of knowing the sphere was trouble the second it was described.
However, I must say that the suspense level in this one...the part I used to feel you needed to work on more...was ratcheted quite high. I was quite convinced of the danger the crew was in, especially during Davenport's run for Engineering and Xia's fight with the security guards.
Now, on to details...
The physical action in this story is among your best. Xia vs. the guards, Davenport's running shoot out with Goodwin, Keller's wine-bottle slaying...all of 'em had that edge only really good fight scenes have.
Davenport continues to be my favorite character. There's no additional reasons for this beyond those we've already discussed, this story just continues to make me like him. Really loved the scene where he tried to out-logic Surall.
Speaking of Surall, I really liked the glimpse into her head we got while she was under the sphere's influence. I also like your characterization of Vulcans...all their strengths, but weaknesses you never see portrayed by the 'super-elf' writers we all know and...well I won't say love (Strangers from the Sky, anyone?).
Loved Ford resolving the dispute between Xia and Surall. With a Captain who appears so casual much of the time, it'd be easy for a 'crackdown' moment to seem out of character. It didn't here, and furthermore, I love the 'chords of disharmony' line. It was gonna be my favorite line from the tale, but then there was that whole 'Pleasure to be of service' ma'am thing with Davenport...
Gore rating: You didn't overdo it on this one, with the possible exception of the whole 'face' incident, though that's probably just my distaste for horror movies coming through. You suggested more than you described, which generally makes it worse.
To Andy: The phaser disintegration effect the Guv favors was only used once in the early seasons of TNG. When this was performed, you saw a flash of the victim's inner construction, sort of implying that phasers vaporize 'by layer'. I suspect that's what was being described in the scene you referenced, for the Guv has very often expressed his wish that they'd just made that the usual effect for such.