There is nothing you can do really, 3.0v/cell should do it for the flightmax cells, as they don't have the best voltage holding ability.
You could get something called the LiSaver, it's an external LVC that you run between your esc and receiver, which IIRC, plugs into the balance connector on the pack.
Or you can just keep a stop watch if you really wanted to and just cut it off at a safe time. I rarely run a whole pack through my revo, just cuz I get bored sometimes, but mainly I want my packs to last... even going from 100% DOD to 80% DOD will GREATLY increase pack life, it can even double the useful life from them. If you only used 10% of your pack, you could get 1000's of cycles from them... but of course that would be nonsense.