Frank Proctor had a similar deal as that partial backstrap posted by Holmes375 on his G34 when I took a class with him. He had taken a beavertail backstrap and cut it below the pin. I think it's a great idea and I've really thought about doing that but I'm exceedingly lazy and don't want to do it on all my guns. Currently I'm running without any backstraps. My tendonitis goes nuts with Glocks but isn't so bad with 1911s, so that more "vertical" grip might be of benefit. Did I mention I'm lazy?
I tried the medium beavertail backstrap in dry fire and I liked the feel but, right or wrong, I like getting my hand a bit higher on the grip, so I ended up leaving it off.