While the attempt by Airbus to provide us with a more comprehensive landing distance tabulation is commendable, the difference between with and without reversers is only about 5% or so.
I wouldn't bother ever applying the with reverse correction, because:
1) it's another potential screw- up/misstep, when you're already busy calculating several other variables. (Do I multiply the factors together or just take the highest one etc....)
2) if the landing distance available is REALLY so tight,that you NEED reverse to justify the approach, then you really should think about using another runway.
3)having applied the 'with reverse' distance on paper, you now find the 'on runway' conditions a little 'tricky', you now have to cancel reverse to retain directional control, or avert some other disaster, and suddenly 'bingo', there goes your stopping distance, out the window!
fugedaboudit.
