Because we never take advantage of it, we usually seem to lose wickets in it instead of get runs. Take it earlier when someone like Moeen is in, and you "should" get a boost, which takes the pressure off near the end. Our problem is normally that we can't get enough runs, at least try something different. Having the run rate under control is fine, as long as you bat all the overs with batsmen in. If you get all out before the total, or end up with 10/11 in for a few overs and miss the total then run rate is irrelevant. Get some runs on the board!