I would recommend to hire experienced bounty manager, yahoo for example. He will do his job professionally, while you can make some mistakes because you don't have prior experience in creation of bounty campaigns. Also, name of good nanager can attract more participants to bounty campaign, while people may avoid campaign managed by newbie because they afraid to be scammed.
You might also want to look into opening bounty campaigns which pays in BTC and not with the token. BTC paying campaigns tends to attract more good promoter and usually get more attention compared to token-paying ones.
Good point, but effective signature campaign requires serious budget if you're paying in BTC. While if you are paying in tokens you can make it from thin air for bounty campaign.