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This is not a direct answer to your question, but a possible improvement and workaround.

I have used both ar_pose (based on ar_toolkit) and ar_track_alvar based on alvar for a project. In my experience the latter one is far better than the former in any terms. Porting your code to use ar_track_alvar will likely take about a couple of hours. The stability, robustness and pose estimation accuracy of alvar library is not the only benefit you'll earn. The ROS driver is BSD licensed and the original library is LGPL which will make it more appropriate to be used in a commercial product.

This is not a direct answer to your question, but a possible improvement and workaround.

I have used both ar_pose (based on ar_toolkit) and ar_track_alvar based on alvar for a project. In my experience the latter one is far better than the former in any terms. Porting your code to use ar_track_alvar will likely take about a couple of hours. The stability, robustness and pose estimation accuracy of alvar library is not the only benefit you'll earn. The ROS driver is BSD licensed and the original library is LGPL LGPL* which will make it more appropriate to be used in a commercial product.