I sailed on her a bit way back in the day (late 80's?, might have been with the original owner), mainly in twilight races.
From my murky memory she was the only boat called a Northshore 31 as she was the plug for the Northshore 32 or 33 (or maybe the 320?) and they wanted them all the same?
Not sure about her doing Coffs races, maybe under a later owner. She sailed well and won a few chooks and red's in twilights, but the original owner worked Saturdays so didn't do much spinnaker racing.
As I said, these memories were from 30+ years ago, so use them at your discretion...