I have never had a problem with any other BGA's that I reworked. I recently found out that the BGA that we are trying to rework is made poorly and warps automatically from the heat. There is nothing that we could do to prevent this. Also the board has a huge ground plane and it changes the way the profile usual works. The maximum temperature that the boards gets to is 190C and I know it shouldnt get this high. I do use the auto profiler for creating profiles, but this one is the one that gives the most trouble.