Welcome to SM mflourishes.
It looks like you have a combination of questions here all relating to the final composite of your fire matched to your tracked data correct?
Well, for many obvious reasons, I and many other working professionals have never used Maya Live as it just wasn't as intuitive and versitile as other mainstream 3D trackers out there. As you are finding out the hard way
Having said that, instead of trying to export your data, you should parent your group of fire elements to one of the track (feature) points (or a locator) so that the fire is in the right position in 3d matched how you want it.
Then, simply render a sepparate pass of just your fire with an UNpremultiplied Alpha and composite that together with your footage in AE
Let us know how that works for you.
PS, I also moved this thread to the correct forum for your question
Israel "Izzy" Long
Motion and Title Design for Broadcast-Film-DS