Great review! I specially appreciate the humour, and the dog pics! 
I just got a TM20K myself and reading your review helped me a lot with some points that were not obvious (I’m quite the newbie with this, this is my first “lumen monster” flashlight).
Now I’m trying to open mine up (see here for reasons & follow-up) , wondering if you or anyone reading this can give me any hints?
TIA!