one of the best wrestlers we have up here had us drill a move off of a failed firemans where the guy sprawls out. You keep tight on the over hook, the next part is 3 moves at once as the arm you had in between his legs you now drive up past his lat (opposite of the over hook) while bringing your inside leg out behind you and posting on it and driving your head to the mat as to make your shoulders vertical. keep tight on the over hook the whole time and it will put you in side control.
If you can Robert, come down and work with Chris Austin on Monday. He has a bunch a stuff from firemans carry. It's one thing to read about it and watch a bunch of videos and it's another thing to practice it hands on.