I'd also like to know about the lower bite...I just received my custom guard from customguards.com (sorry Scott, but I didn't know about python until today when I read this review).
Anyway, mine doesn't have the lower bite and I'm wondering at this point if I can somehow get my teeth to mold on the bottom a little or am I Sh*t of out luck, so to speak?
I just notice that when I clinch my mouth shut hard my jaw doesn't seem as tightly closed...wondering how this will effect my face getting punched.
Please advise if you would, even though I didn't purchase from you.
PS: I will purchase from you for my next custom guard.