Tips for playing WW?

Plat level Jungler, can play Vi, Viego, Brand as my main pool but been recommended WW to add to said list. Been playing a few Normal Draft games to get used to him again as I havent played him in Years. Im "Winning" but dont feel like I do anything on this champ. Ult gets Cancelled easily, 35% damage reduction appears laughable in team fights. Any advice for someone who as decent mechanical skill but mainly plays around Macro?