You may want to double check whether or not that old comp-n- choke tube is OK for hevi-shot. When I called them a while ago asking whether or not I can shoot hevi-shot in their tubes they told me no. Things may have changed but it can’t hurt to confirm with them. Your numbers are a bit low for that load you may want to experiment a bit more.
I’ve been shooting them out of that choke for years. I know Kick’s advertises as lead only, but never heard that about Comp N choke.
I have an 11-87 with a 28” barrel that puts up quite a bit better numbers in the 10”, but not as even.
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