I love my new 92X--even the OEM grips are nice. Very grippy, but hard polymer.
The grips aren't too big, but they do have a SLIGHT palm swell, which I'd rather not have.  
--
Does anyone know the thinnest brand of VERTEC-style grips?  

WC makes some thin ones in the non-vertec style, and I've heard Langdon's are thin, but I don't think they come in vertec.

Tagged

I've got a pair of Hogue that are G10 and pretty thin and no palm swell.  https://www.hogueinc.com/handgun-grips/beretta/92vertec/g10/beretta-m9a3-vertec-panels-checkered-g10-solid-black

My 92X Centurion measurements for the stock and the WC Vertec grips.

WC - 1.36 at top, 1.33 on the logos, & 1.36 at bottom

Factory panels - 1.33 top and bottom & 1.37 at the logos

Difference is very negligible.

ETA:   You said you noticed a very SLIGHT palmswell, and good night is that very slight.  Do you feel your hair grow from day to day as well?  ??

Hahha. Yeah, the constant pressure of the hair follicles pushing through my skin makes it hard to sleep.

Actually, I just looked at the gun from the rear. I AM shocked at how much 1/10th of an inch here or there matters in gun grips--the G43X/48 isn't that much smaller than the 19, but it feels so much better. And the 365XL grip feels even smaller.

My 93X grip is fine for two-handed shooting; I just have to SLIGHTLY shift my hand to release the mag, whereas I'd prefer to be able to do it without moving my right hand. That would require almost flat grips with minimal curvature.

NOTE:  The Wilson ultra-thins grips for the 92FS were always my favorites.  
But everyone seems to love LANGDON grips too--I wish either made thin grips for Vertec frames (I assume VG makes grips for both companies).