16G for 1/12 MOD works fine. I think Donny Lia uses 16g and he is fast. I have talked to TQ and they have a few drivers running 16G in mod without any problems.
I run 1 3.5 for 1/12 MOD and will be trying 16G the next time out, I think it will be ok. My reson for running it is to help reduce pod tweek.
Steve Dunn