Montana,
You can use a physics handle to attach the light to a bone in the physics asset.
In the components tab add a physics handle component. You can specify the attachment that way.
Hope that helps
So it’s still not solved? My physics asset goes crazy flying around as well. I tried all above and nothing changes it.
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Here is a video showing it and here is my asset and apex file for it.
Any news here? Did you solve it?
In almost any of the physics assets I created myself the bones are jumping around like crazy and I just can’t figure out how the pros do it even when I look into working physics assets.
There must be something that beginners like me are doing wrong. 
Any help appreciated.