Just as an update: GJM remembered having feeding issues with the Underwood 200gr hardcast. For me it had always seemed very reliable, but I also didn't remember intentionally trying to make the gun malfunction.
Just took my last few boxes and tried to make my G22 gen 4 jam with that ammo. I loaded only 5 in the mag to reduce spring pressure and shot one handed, as limp wristed as I could without the gun actually flying out of my hand. While limp wristing to the best of my ability, I held the gun sideways to the left, to the right...it ran like a top, no malfunctions or hiccups and it locked the slide back every time. I ran out of ammo before I could test my Gen 3 G22.
This stuff runs at 950fps through the factory barrel and 1010 fps through a KKM 5.5" barrel. A bit shy of GLB's 10mm numbers, but for me seems like a good compromise. About the same velocity as the old Skeeter Skelton load. I've got pretty average sized hands and I find the G22 is substantially more shootable in rapid fire than the G20; also easier to shoot one handed.
So...that's where I landed. I've still got my G20 (and various 44 mags and 45 colts and 454's), but for now sticking with the G22 and this 200gr hardcast.
Appreciate everyone's knowledge and experience.