I don't believe that there are any dimensional difference other than length on the XL grip module, so that's not going to help out with the diameter of the grip frame. It will basically feel like a standard P365 with a 12 round mag extension.
The main reason for the swap to the XL module is that many feel that it makes mag changes easier since there is no extension to interfere with. Never been something that I've had an issue with on the standard grip module using 10 and 12 round mags though.
I haven’t even held an XL, so I don’t know if I’d like it or not. I’ll see if they have one at the LGS/Range next time I go and check it out.
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