How to join multiplayer social campaign which is my level, not higher?

how to join multiplayer social campaign which is my level, not higher ?
Everytime I try to join a random campaign I get matchmaking with higher level campaigns that would spoil story …

the social matchmaking isnt that good ?
proving grounds and waves there are no players around. no matchmaking possible in those two multiplayer modes because of lack of people playing or it is bugged.