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That must be your device then because on my devices the video is too loud to run on the highest volume. I have a professional microphone as well. I measured the decibel output and I got an avergae of about 55 db. I think that is pretty good. I am not able to record any louder than that.

Could you please test this from different devices for me? You are not the first one to mention this but I cannot reproduce it.

I'm at the Toronto Public Library now using their computers and the sound in your video is fine. If I find a way to improve the sound on my Android phone, I'll let you know.