Canon 7D: AI Servo tracking sensitivity

The AI Servo tracking sensitivity, it's the C.Fn III-1 setting. I wrote about it in: High Speed AI Servo Tracking and in C.Fn III -1 AI Servo Tracking Sensitivity. Its purpose is to direct the Canon 7D on how fast it should switch focus, when something come in front of your subject.

My own setting used to be to setting to:

Slower than medium, but faster than slow

This is a good setting, if you are trying to track an already moving object/person/animal and something/somebody interfere in front. But what about an object/person/animal that is not moving, and then decides to move?

That's where I have found that this setting didn't work well for me. I have found that I've missed too many photos as out of focus, when the focus is still at the point that the object/person/animal was, and not where he is now.

I've found by mistake that putting on Fast make the Canon 7D, nervous, very nervous and trigger happy. Much too fast for me, but I'm an "old fart", my reflexes must become too slow.