Assuming the CIFLO data is correct, both the sectors mentioned handled well in excess of the published capacity during the Regulated periods (in the order of 20-25% more in some hours). I am not a West End expert but don't think the capacities were reduced in any way from their normal fully operational ones.
Instead of trying to suggest LACC were being economical with the truth, perhaps it would be more appropriate to wonder how bad the delays would have been if the staff hadn't done such a good job moving a lot more than their capacity was flowed for ?
G-MANN, where a pint is trying to be poured in to a half pint pot, there is always going to be an overspill (which manifests as delays in this case !!).