The average bounty allocates the most tokens for Twitter, Facebook, Signature, Youtube and Article campaigns.
is there a bounty that allocates higher tokens to the Signature campaign?
There are some bounty projects that exist which allocates higher tokens rewards targeting signature and twitter campaign for a total of 100% but those project are applicable only for higher ranks on thread can do participate the said project.
There are many projects that allocate tokens in signature campaigns they offer higher rewards that's why you have to manage the projects. You can participate by analyzing when a project will come twitter has more tokens allocated to signature campaigns than facebook.