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?
I've been out for a while in bounty campaign, but based on what I noticed, the signature campaign has a higher allocation in most of the bounty, there are also bounties that gives a huge amount of supply to the bounty campaigns, but they are mostly a failure or scam, the high allocation is just to attract bounty hunters to promote but the project has not good quality.
I suggest, you look at the most important factor, and that is quality over quantity.
Signature campaign may be the one with highest allocation few years back, but it is not anymore since most token are allocated mostly equal for several different bounties. In my opinion, the one who decide the token allocation is the dev by looking at many factors. The dev will allocate more token in a place where they think they will get better result than the other places.