I know you weren't asking me, but here's my reply, lol.Why not 22? Besides the lesser selection of available tires.
I'll admit yours, and the other member who just posted pictures a few weeks ago of his Charger with 22s as well, both look good.
The reasons I'd stay with 20s is; I like the rotors to fill up the inside of the wheel, but moreso I don't like the rubber band tires. I'd destroy them not only on the horrible roads, but I occasionally have to drive on gravel parking lots or roads, and a nice stone would be big enough just laughing there if you hit it right to take a chunk out.
Just my .02, although like I said yours do fit well.