I had several New Haven Model 70’s, still have a couple. IMO not better or worse than other rifles at that price point at that time. Certainly better than current production Ruger 77/Hawkeye.
Personally I wouldn’t rush to judgment (or gunsmithing) over the first 3 rounds out of a new or used rifle. Many will settle in after 200 rounds.

If you can't improve on silence, shut the #@&% up!