You can't solve all problems in an instant, but seeing you seeking for the members advise, I can say that's a good move.
All the 3 campaign managers are good managers, I have work in all 3 of them and I can say they are very professional in handing their campaigns.
Good luck, hopefully they'll agree so it will help minimize the spam problem.
There is one manager above has not yet mentioned, LoyceV.

Good managers will not allow their participants spam and get payments. Spam posts or low quality ones will be rejected as eligible posts for payments. So, good managers will do eradicate spam posts from their participants.
But good managers may not accept their offer to manage their campaign since they have lot of bad reputation in the past and still people coming and crying that they got scammed which will affect the manager's reputation.