I am shooting nearly the same configuration--M2 24" BBL, IC Choke, Hevi-13 3" 2oz 6's.
I'm getting 186-225 hits in a 10.5" circle at 40 yds so your numbers are pretty much in line--maybe slightly low. (I'm using 10.5" because that's the closest paper plate I could find) Doesn't really make that much difference unless you're comparing with someone else.