You might want to pick several tracker points and make nulls. Make several nulls then see which one works the best. Forget the create text just create nulls. Then create your text, make it 3d, parent it to a null, then set the position of the text at 0,0,0. This way it will be exactly where the null is.
Actually, for a simple pan shot like this you might want to track it with the regular tracker,