Here is a thread on the issue and my summary of autocross performance of the NT-01's.
Source for shaved Nitto NT01's?
I would say if you are concerned enough to feel the need to shave the Nitto for maximum performance in an autocross you should just start with a V710. It is a much better autocross performer than the Nitto because the Nitto doesn't generate enough heat quickly enough to be a top dog in an autocross.
Of course, Hoosier autocross tires would be great but will wear faster than a V710. I wouldn't count on the BFG to be a long lasting tire from the tread design and wear rate. However, you wouldn't expect the V710 to last as long as it does for most people so who knows.
I run Nitto's on my Boxster S in autocross and used a pyrometer on them at an autocross school this past weeekend. Granted it was a rather cool, cloudy day but even with multiple hard runs back to back I couldn't get the tires close to the optimum temperature suggested by Nitto. I posted elsewhere on this site but I believe it's 160 to 220 degrees F. I think they are a great tire to drive on back and forth to events and have decent performance at autocross just not the best.