I've spent lots of time on here enjoying the thoughtful write ups about how to shave the foam down on my monster M750 and I just wanted to chime in with one more level of seat mod that's possible. I simply made the seat pan about two inches narrower by making 1 inch cutouts on both sides of the seat pan, where the inner legs would touch. It's turned out to be super easy, still looks completely stock, and as you know, a narrow seat can really help!
http://www.flickr.com/photos/94149333@N07/8567825675/#