My traffic is on a consistent upward trend but my clicks are not. I know lots of things can make a difference to the CTR, however my problem seems to be that there is no consistency (despite all things i.e. traffic sources, bounce rate etc.). Do clicks simply become more consistent with larger amounts of traffic, or are some niches just prone to instability? Any help greatly appreciated

Getting between 250-350 UV in case that is of any help.

250-350 is a relative small sample size, thus the clicks can vary a lot.

try to aim a certain amount per day rather than how many clicks.