Yep..........You should go ahead and polish & deep clean that barrel. 191 pellets isn't really a low number, but being that you are using a 3.5" shell, you could probably do better. For reference, my gun, a Rem 11-87 using 3" Magblends gets 180 in the 10" and my handloads are getting 180-210 with 1 3/4oz shot, depending on the load.
But utimately, if your happy with your guns performance, thats really all that matters. Get it sighted in @ 40yds and you'll be killing the turkeys all day within reasonable ranges.