You are doing exactly what I would NOT do.
The G-19 is one of the best all-around pistols there is. My new wife wants one, I'll probably get it for her soon.
The P-220 is a fantastic gun. If I wasn't so well-matched to a 1911, I would give it a serious look. Not a thing wrong with it.
There is nothing wrong with a 9mm. Particularly with good modern ammo. I prefer 147 gr sub-sonic HSTs.
I stopped carrying a .40. It is a good compromise of something, but it isn't a good compromise of others. You get more muzzle energy than a 9mm or a .45, but I quit believing in muzzle energy as the decisive factor in stopping with a pistol. It causes less cavity trauma than a .45, and has less capacity than a 9mm. And it has snappier recoil than a .45 OR a 9mm. And if I really wanted to maximize the idea, I would want a 10mm, loaded full-house.
For me, a .357 SIG is something I might consider for a sub-compact gun, where I thought the 9mm loses a lot of velocity.
I'm not too worried about capacity. In real life, I don't live in Melgibsonland where you are going to empty your pistol without having two seconds to reload. I think that being able to clear a malfunction in a pistol with ANY capacity is much more important than having more rounds to fire. If I'm in trouble I can't solve with a 1911, it's unlikely that I would be able to solve it with any other pistol either. (I would be wishing I had a serious rifle.)
I see no reason at all to move from what you've got.