Nice work Dana. You should be able to see it OK in a 200mm. I've seen it in dark skies through a 4.5" but it is fairly obscured in the starfield. To me it took a bit of teasing out and was a very faint, very small glow, certainly less than the 4' diameter you were seeing. Maybe 2' or so from memory was all I was able to get but I was pretty happy to see that.
Cheers -