Have you instead tried Picture-In-Picture effect?
In essence, you will place the logo on track 2, and scale/crop it if necessary Add the Transparency effect if desired.

Now, if you truly want your logo behind you, and employ chromakey (green screen), try the different settings in the drop-down menu.
Also, fiddle with the sliders, especially the threshold.
Understandably, the color being keyed out must not be evident in other parts of the video or they too will vanish.