I dont think good signature marketing has to be judged based on the complete wall of text or just like you call it big posting. The biggest posters might not generate the traffic you need, it is where they post in the forum that would give you the traffic you need.

However, from the list of names you mentioned above, JayJuanGee and Franky1 are my best picks. The reason for so is that they engage in conversations that are interesting and they create traffic in the forum. Currently, JayJuanGee has attracted several people to himself because of his dialogue.