I just posted this in the Fluid HT thread, then realised other Norco bike owners might be interested too.
It looks like there is a new angleset product, compatible with Norco bikes with integrated headsets IS42/IS52.
Claims to slacken the bike head angle by 1.3 to 1.7 degrees
I will likely buy one in future. But if anyone else does in the meantime, please post your experience positives/negatives etc.