I have a couple of long runs that require 10ga. Decided to use 8ga just to make sure it wouldn't affect the signal. I'd rather be safe than sorry.
FYI - Just found out GLS has decided to stop making/marketing all wall plates. When they run out of what they have, that's it. Shame. I suppose I'll have to try drilling the holes larger on whatever brand I decide to go to, unless somebody can tell me where to look.