I figured it out. For anyone else out there that has a Verizon M8 and are using it on AT&T, you can convert your phone to the AT&T variant. I'm getting LTE but not constantly, it switches between LTE and HSDPA but it's staying mostly on LTE. Yay!
Samsung Galaxy S5 - Current
Samsung Galaxy Note 3 - Current
OnePlus One - Next
LG G3 - Next