Brob, it's a hit and miss (sorry for the pun) on after market chokes. Pattern your factory crio chokes first and see if it gives good results with the ammo you choose.
I've tried the carlson x-full in mine but I still get better patterns out of the full choke that came with it. I was able to harvest a couple birds with it. I was shooting 3 1/2 mags.
I found an X-full made by "Dead Coyote?" Which gives me just as good pattern using 2 3/4 shells. I opted for that one because I just couldn't get used to the heavy recoil from 3" and 3 1/2" shells.
Good luck on your search, just remember that your gun is unique to you pendent on ammo/choke combinations.
Congratulations on your purchase of the Super Nova.