The camera heights in .iPiCalib file (2.3 - 2.6m) are substantially greater than I see in the action video (about your height). You should adjust scene's scale accordingly. After I've set the scale so that camera #1 height is 1.75m, the actor's height of 1.77m has matched the video.
However, when aligning an actor with the video, I've discovered that I could not do that in camera #2. Its image looks slightly shifted. I suppose you might have moved this camera occasionally while going to PC and back between calibration and action shoots. Be careful about that.
The worst thing with your action video is lighting.
It is too dark - you see, the image of the cameras are very noisy. The only acceptable image quality is in camera #4.
The scene is lighted from one side only - due to that colors in the opposite cameras #1 and #3 are barely distinguished, especially in shaded areas. You should avoid directional lighting to get good tracking. Light sources on the ceiling are usually the best option. If you cannot avoid directional lighting, use lighting adjustments on the Scene tab to take it into account.
I've attached an action project with correct scale for cameras and adjusted light source position to give you an idea. However, tracking still does not work nicely due to the problems stated above.
Also I recommend you to change camera positions. Specifically, cameras #1 and #3 a very close to each other, having almost identical point of views. The same about #2 and #4. You should place the cameras to get as many different POVs as you can.
Given your conditions - small room and poor lighting - Kinects may be a far better choice. With 2 Kinects in 180 degrees configuration the quality of tracking will be comparable to 4 PS Eyes with good lighting. The only drawback is frame rate of 30fps, which may be not sufficient for some fast motions. Using more than 2 Kinects does not have much sense for tracking a single actor.
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