Ok, so let me be clear, this is a case of operator error. The BG5 actually seems to work fine.
A month or so ago, I began using the BG5 instead of my Precision Xtra to measure blood glucose, just because it was a little cheaper for test strips. Well, for the past month, my blood glucose has been around 110mg/dl - where before that it was consistently 70-ish in the mornings. To make a long story short, I read the vial of test strips my BG5 came with and it turns out the strips are rated from 113-170mg/dl! So I ordered glucose strips for my Precision Xtra and tested back to back. Precision Xtra - 70mg/dl. BG5 - 110mg/dl.
Seems pretty obvious, buy maybe someone else can learn from my mistake.