I’m not sure your WW barb is set up the best way
You can look at the low end of leaderboards for solo barb (right click a hero to see details) to get some inspiration. You can also search for maxroll wastes or icy veins diablo barbarian. The high clears use ancient spear to drag in monsters. It takes some practice. At lower levels other skills can be used, which you can see at maxroll. If you both play the barbarian you can help each other by sharing loot. Another way is that one of you play support barb and the other goes full damage - or start a new hero and get a power boost to level 70. If you look at the 2 player leaderboards you can see examples of support barbs.