I'm pretty good at math. Let me see.... 2700 x ~22.2 = Grenade. Yup, looks right.
Seriously, anything much more than the nominal voltage on the LiPos could put you over the rated RPM limit (60K) for the Neus. You might say that the batteries will drop voltage under load while at speed, but don't forget burnouts! If you told them you were running 6s I don't think they would warranty it.