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@ChrisNW
Now riding 165's (for last couple of days) have ridden 170's before that for two years, 175's before that for ever.
Swapped 175 ->170 because of knee trouble. 170 more comfortable because less range of motion.
Swapped 170 -> 165 because new bike came with them, but notice the difference mainly when out of the saddle, it's easier to maintain a smooth circular motion with the smaller cranks.
When sitting, 165's feel much like 170's apart from slightly harder to pedal for same gear ratio (due to less moment - obviously).
Another thing: first impressions on going downhill fast, there's less tendency to bounce around in the saddle with shorter cranks.
Hope this helps.