We replaced the 2 blade c/s prop on our Arrow 2 with a 3 blade c/s prop several years ago:
The main reason was that FOD from landing at another airfield had written off our prop and surprisingly we got a far better deal on the 3 blade than a 2 blade.
The change of prop has made absolutely no difference to the performance: the only difference discernible is an increase in vibration which persists despite dynamic prop balancing.
Safe flying
Cusco