Today, I said fuck it, whipped out my Dremel tool and went to town. With the Gen5 out now (as a southpaw the ambi slide stop/release alone is worth it to me), I decided to turn the 19.4 into a project gun. The only other gun related thing I've used my Dremel tool for is opening up the loading port on my competition shotgun, but I'm pretty happy with how it turned out overall. The support hand cut could've been better, but it feels way better than stock. My fingers aren't cramped together anymore. Finger groove removal and stippling next.
If you're on the fence about doing this work yourself, do it. There are replacement frames galore