You should spread the hash around a bit. It's not healthy for the network to have a disproportionate hash directed at one pool. Yes, the pool with the large hash rate gives more consistent payouts; however, if the particular pool has an issue, it negatively affects the whole network in a bigger way. See what happened earlier, today with PoolofD32th.
(I admit that I had my hash pointed at PoolofD32th too. However, looks like I took a haircut because of it.)