Lip Tracker: Are MouthSmile{Left,Right} and MouthSad{Left,Right} useless parameters? Is the tracker racist against beards?

[halcyonWas]

I've tried smiling more than I ever have in my life, attempting to pantomime to my face tracker indescribable joy in the hopes that MouthSadLeft will blip the needle off 0.0, and the most it'll manage is an intermittent visit to 0.1 or 0.2 out of a normalized range of 1.0. Similarly, I watch the MouthSad{Left,Right} parameters and summon all my acting ability to frown as much as I can, and they rise merely to a 0.2 or 0.3, making a mockery out of my capacity to express human emotion.

Are they just worthless, pointless, time-wasting parameters? Is it because I have a moustache and beard? Is there a word for an -ism against facial hair? Is this a known bug and will it be fixed?

[halcyonWas]

I should also say that when I first initialize the tracker it provides a slightly better range, going up to 0.6 or so, but it seems to self-calibrate and gets worse as time goes on.