Here we have test project ue4 v4.13.2 Dropbox - MyProject4_v4_13_2.rar - Simplify your life
Run project for 2 players.
player 1 click host, after load map, click C for Crouch, capsule size changed
player 2 click Join and look to Player 2
Profit: With Rep_Notify capsule size and SetRelativeLocation not work.