I don't shoot the Nitro Pixie Dust any longer. I handload Tungsten shot. I had a custom choke built for my 10 gauge to match the wad I use, and my Indian Creek Choke out performed the custom one. I'm shooting a Remington SP-10. I haven't tried a head to head comparison between my Rhino Choke and my Indian Creek Choke. I probably should; it's awfully hard to beat a Rhino Choke.
If super tight patterns are your main goal, I don't think you could improve the 80-90% patterns you said you average at 40yds from your current configuration. Don't think I'd give the Rhino a second look.
While I prefer patterns at 45-50% 10" center density at 40yds, I've never seen or even heard of anyone who was averaging much beyond 60%, even with tungsten.
