Ultra Keyer.... How do I key out additional elements?

Hey all, I just keyed out a static scene and got a good overall key, However the desk that my speaker was seated at absorbed a small amount of the green reflection. It's causing a bit of noise during playback.

I'm trying to figure out how to get rid of it. I created a black and white image and then pointed to it as a track matte but it's just not working. I'm getting all kinds of weird results. I should note that I recorded at 1920 X 1080 but am editing at a lower resolution to give me flexibility in post.

Can anyone tell me the best workflow to add an additional black and white matte to my Ultra-Keyer so I can mask out and protect the desk in my image from being keyed out?

Thanks.

Thank you, I had tried spill suppression, but the green reflection was just too prominent. It can't fine tune enough to get out the small amount of reflection that causes static noise when playing from frame to frame.

I really just need to find a way where I can protect a section of the frame from being keyed out altogether.

Dragzz