I can confirm that Zhentouk is right. Unreal is location based, not rotational.
Having the same problem here; I need to get character to jump along a rotating column… and a small delay will cause players to miss the end of the columns. Our solution was similar to Zhentouk, We extrapolate the client into the future with the lag amount. Such then when player jump, the rotating column will match his landing both on client and server. (It was very tough… let me tell you that.)
The problem we have is after that though. Since unreal update player position with relative location with disregard the base rotation, lots and lots of thing go wrong afterward.