If you've never perused the Scott Stokley books/videos, you should. His knowledge is on par with many of the best commentators, Dave Dunipace, Mark Ellis and others. In his videos he comments on the fact that you might have a number of discs of various dimensions, drivers vs. putters etc. and that your grip has to accommodate those differences. Interestingly enough, we are at a unique juncture in terms of disc production, that is in terms of drivers. For the first time you can actually buy a set of discs (drivers anyway) all with basically the same dimensions. Take for example the Valk, Viking, Sidewinder, Roadrunner, Firebird. All of these discs have basically the same rim width configuration 1.8 cm to 1.9.
Basically, you can buy a set of discs from understable to overstable with the same configuration. Indeed, the two major manufacturers now have sets of discs in the 1.7 to 1.9, 2.0 to 2.2, and 2.3 and up ranges that range from under to overstable (I've not looked really closely so there may be some holes). I'm wondering if players would view this as an advantage, i.e. rather than hunting through discs to find a set that meets your needs, you could select discs differently, this set fits my hand well (that is the grip I use), presumably giving greater control, now all I need is the under, stable, and over versions in this configuration.