Tracking two lights

[Render]

Has anyone else noticed that if you set up the lights properly (according to the specs) that it is very easy to lose one of the lights, because the blobs are so tiny? Yesterday we put the lights at the proper distance and position and the instant we moved the camera a tiny bit it locked onto either the left or right light.

Is this normal, or do we have a calibration/code issue?
notes:
-we already had to lower the confidence in Kevin's code for it to lock onto two lights
-We lowered the search delay so that the camera would track faster

Thanks