If your just bashing it then run 3.4v IMO. You are probably talking about less than a minute of runtime between that setting and the 3.0V setting.
Any damage that is done to a battery is usually done in the last 5% of the run time. I personally try to never run my packs down below 80%. It just makes them last so much longer, keeps them in balance better and is all around just so much easier on the batteries.
Is that extra minute of runtime gonna really make or break you? Its up to you, but with expensive batteries it seems to make sense to me to play it a little on the safe side.
I can't decide if its more fun
to make it...
or break it...