I use this sollution. It runs the updater every 10 minutes.
Before it runs the Coin Updater it deletes the LocalCoinData.json file (resets stats)
30 seconds after starting.. it stops The Coin Updater.

Configuration in Awesome Miner:
http://www.bla-bla.net/updater2.png

This is what my "starting" batch looks like:
http://www.bla-bla.net/updater3.png

This is how my stopping/terminating batch looks like:
http://www.bla-bla.net/updater4.png

Works fine.. You get fresh info (no averaging) every 10 minutes