X2 videos too quiet - Facebook

We’re live streaming a church service with the X2. We tried the Monoprice hdmi audio injector, but never got the volume we needed.

We plugged in a Behringer U-Phoria UM2 which worked flawlessly though the USB port. Unfortunately, even with the pre-amp, I’m still not getting enough audio volume while streaming or playback via Facebook.

The Behringer seems louder, but pushing our mixing board to clip point, the UM2 to clip the improvement is marginal, and our videos are still too quiet. Does anyone have any suggestions?