I downloaded your project and the setup is a little odd. There is no difference between a spotlight with a 180º cone angle and a Point light except that the spot light will only cast light away from the light. You have a ton of tracking markers which suggests that you camera tracked the shot, did not set an origin and ground plane, but just selected a bunch of points and chose to create nulls from all the points. That means that you don't have a zero starting position for the camera (Point of Interest at 0, 0, 0 in comp space) and you do not have any nulls lined up with the ground plane where you have chosen to place your shadow catchers.
The point of interest for the spotlight is way off from the Shadow catcher layers, and their positions do not match the position of the null they are parented to.
The position of the Projector layer (copy of the tracked footage) is also a little odd, and so is the orientation.
My normal workflow for something like this would be to Camera Track, set an Origin and Ground plane, then use the same target to create a solid and a camera. I would create a solid instead of a null because you can see it, you can change the size of it and turn it into a surface that matches the plane, or use is as a guide layer so that the tracking can be verified.
Then I would parent all 3D layers and the camera to a new 3D null names "Comp Center" null that was placed at 0, 0, 0, then reposition the null to Comp Center. Now new layers 3D layers will be centered in AE's comp space. I would make a copy of the Footage layer you want to use as a projector, make the layer 3D, and Shift + Parent it to the original 3D track solid that the Camera tracker created. I usually set my Track Solids to Guide layers so I can see how the tracking works but they don't render.
Then I would add a Parallel light, and move the light position to the starting Camera position - Shift + Parent. This will keep the light source directly behind the camera, which would work for Camera Tracked shots. where you need a projector unless you want the projection to be applied to another layer.
I would then duplicate the footage layer, make it 3D, name it Projector and Shift + Parent the footage to the camera or the light. You can then just grab the Z axis if you have the selection tool set to orient to layer, and slide the Projector layer away from the light keeping it perfectly aligned with the light.
When you have all layers properly positioned, you can set the Shadow Catchers to Shadow only and not accept lights, set the Projector layer to Cast Shadows Only and 100% transmission, and you should be set up.
I spent about 15 minutes trying to line up a light and point it directly at the Shadow Catcher layer, then move the Projector into position without success because the camera had such an odd focal length and nothing had been arranged the way you would arrange a 3D comp that was not camera tracked.
I don't know if that helps. There used to be a great tutorial on Camera Tracking and setting up a projector on a surface with CS5 I think, but I can't find it. Maybe I should do another one. Properly positioning the light and the projector layer is critical in getting the best resolution for your projected shadow.
I'm not sure what the end goal is, but right now, all you have is two shall shadow catchers that match the original footage. I'm not sure where you are going. If you explained the design goal, maybe I could give you some better suggestions.
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