Looking at your description and images, it looks like you are pasting track data onto a 3D Null? Are you looking for a camera track or corner pin track?
To test that the tracking data is accurate, try exporting a corner pin track out of Mocha onto an AE solid layer. If that is looking proper, then your track and layers are set up fine.
If you are indeed expecting to use Mocha for 3D tracking, than you need to have at least 2 planar surfaces tracked before you do the Camera Solve in Mocha. This also requires the free “3D Track Importer” plug-in for AE.
(download link: https://borisfx.com/downloads/?&product=Mocha%203D%20Track%20Importer)
Remember that by default Mocha is a 2.5 D tracker, so if you are only exporting transform data, the rotation is simple and not 3D rotation. If you want to put a logo on the helicopter, try the corner pin workflow.
Without knowing your experience level of Mocha, I hope some of these ideas are useful.