If you are not able to set something up with someone on your own I´d be happy to try and build a trip for you while you are here. Just drop by our office or give me a call and I will note your dates and contact information and contact you if we get a match. We have an office at Veracruz 204 in Barra de Navidad, our contact number is 355-8582 and I do get requests for shared fishing trips. I have one right now for people who leave on the 6th of January.
I have information about the boats here, the Mary Chuy boats are not ours but we do arrange bookings for them, the other boats are ours.
http://www.seatosierra.com/what/bt.html
We are a Mexican company and all of our guides are local Mexican´s who know these waters very well. I am the only foreigner in our group and I don´t lead boat or fishing tours.