Considering FARs (and bear in mind there are differences here both in terms of between authorities and historically also):
§121.195 "Airplanes: Turbine engine powered: Landing limitations: Destination airports" pretty simply lays out that the required landing distance for "wet or slippery" conditions is based upon a simple ratio of the required dry distance, per your summary [RLD(wet)=1.15*RLD(dry)=1.15*1.67*ALD(dry) ] UNLESS the manufacturer has approved data which is different (with the caveat that RLD(wet) may never be less than RLD(dry) )
There is therefore no requirement on the operators to have access to "real" ALD(wet) data nor any requirement on the OEM (in Part 25, say) to produce such data for the operators' use. This means that there's no incentive for either to have that data specifically available unless it's better than the 1.15 factor would be (unless they care about people sliding off runways, of course). Even if it were available, it wouldn't be "approved" data - because there's basically no reg to approve it to - and would end up in a non-approved supplement to the flight manuals.
IF specific data are provided they'll have been generated based on a combination of flight test data and empirical data for the effects of various states of the runway (and the same goes for contaminated data, for snow, slush, etc.) but if no specific data for the ALDs are given then the RLD(wet) is simply defined by rule from the dry performance and may not relate to the real wet performance of the aircraft.