Most airports which give damp,i have found the landing distance to be very close if not exactly as dry perf..
That is likely because of the assumptions made regarding the antiskid system when using autobrakes.
Since autobrakes target a specific deceleration rate in intermediate settings, either the autobrake regulator or the antiskid regulator will release hydraulic pressure as needed. With good braking action, the antiskid regulator will not come into play at lighter autobrake settings, so the calculated stopping distance will be the same with wet, damp, or dry. See for yourself, by selecting progressively worse braking actions, and noting at which autobrake setting the different stopping distances show up. Also note the differences for max manual braking.
It is when the braking action is medium or less, and the braking action is higher (e.g., for shorter runways or early turnoffs) that the antiskid will come into play, overriding the autobrakes and increasing the stopping distance. This could be a factor in either a short-runway landing or a rejected takeoff.