I think you may be getting the distances mixed up.
Dispatch requirement is 1.67 dry, and 1.92 wet, of the DRY landing distance.
Dispatch to a contaminated runway requires 1.15 times the CONTAMINATED landing distance, or the wet figure if it is greater.
Once airborne, their suggested factor for a contaminated runway is 1.32 times the CONTAMINATED distance, this is not (yet?) a legal requirement.