I never seen a pic of a Pré-V Cg showing the thickness you're talking about, most of the watch are pictured from face and not side.
The main reading I did on the subject is the one in the link posted by Avenger, in that whole text they speak of all the difference between Pré-V and Pré-A, and there's not a single word about different CG, on the other hand there's a pic of a Pré-A CG (picture I link in this thread:
http://forum.replica-watch.info/vb/showpost.php?p=741024&postcount=15).
So basically I assumed that Pré-V and Pré-A had the same CGs...
Where did you find pic showing thick CG?
How can you be sure that all Pré-V have same Cgs? Especially knowing Panerai consitancy on reproducing stuff...
I'm now convinced you're correct but I also would like to know where you find those infos!