M_Glenn_M
I agree I love the GR20 too. Once I set it up it responds great.
It took some time but I've learned to emulate the techniques of several instruments so it sounds closer to the real thing.. (EG harmonica, pianos, horns)
I own both the GR20 and two AXON 100mk2's. With both brands I had to fine tune them and then it took years of playing to develop a much cleaner, almost piano style. Remeber these thing pick up the "transients" and so it helps to use a pick, or your finger nails. Oddly, my GR20 works much better with my nylon string Godin Multiac synth access guitar, but it does not track as well with my Godin LGXSA midi guitar that has steel/nickel strings. For steel string midi guitar, I use the Axons. Axon is probably the industry standard and tracks excellently; you don't get too many ghost notes with it, at least not when you get proficient at midi guitar technique. Pat Metheny uses Axon live, or at least he did for years and when I heard him live I never heard ghost notes. Oddly, the Axon does not track as well with my nylon midi guitar even after years of setting it up; that is why I have the GR20---for nylon midi guitar. Go figure. But that is why I own/use both GR20 and AXON midi controllers.
My advice for midi guitar players, is to think/play like a pianist, play a clean attack, use a pick or finger nails, and get excessively clean in your technique.
M_Gleen_M. I agree with you in that once you develop a clean technique, you start to emulate the techniques of the instruments that you are setting for synth sounds. I play a trombone different than a B3. Although I think this is more phrasing than technique.