This is the only fault I spotted
2. Minimum 20 constructive posts per week with our signature.
I think you should reduce the number of post per week,
I will encourage you to follow the footstep of some of the high ranked members who are bounty managers.
when you see some bounties been run by most of these high ranked members, they normally ask for 10 - 12 post max in a week.
I think that number will make the hunters make some good post rather than trying to meet up with the 20 post
it will also reduce spam in the forum, let's say you have 120 people in your signature, with 20 post per week
your bounty campaign will generate minimum of 2400 post per week and most of the post adds nothing to the forum.
The best you can do is to help the forum fight spam and it begins with you by cutting down your post requirement per week.
this is not just for you but for other managers as well.
Good luck with your campaign.