for 24 hour profitability settings, why would you not set it to 1 minute or 5 minutes? It doesn't switch very often anyway. The problem I have with that at least on my system is it will basically just mine bitcore forever.
From my experience you need to be careful when selecting pools for this. AHashpool is most reliable in terms of not experiencing / showing crazy spikes, while zpool and MHP are the worst.
In my experience, ahashpool stats are totally misleding. I deactivated it from my profit switch.