John,
Having no experience whatsoever with the 335 R6 tire, I can only base this response on my seat of the pants feelings that "wider is normally better" when it comes to road racing our old Dutsuns. Knowing that your setup has gobs of HP and torque, would lead me to believe that you would benefit from the taller gear ratio provided by the larger diameter tire/wheel combination and the added traction of more rubber on the ground. Sure, the wider tire would create more drag but that shouldn't be a big problem for you. We have discussed ways to lower the rear end our cars by raising the mounting points of the differential. Now would be a good time to consider making these changes to the rear. Logic would dictate that you would improve lap times by being faster through the middle and getting off the corners. I believe more tire would accomplish this for you. Also, I would agree with you about Hoosier making the wide boys for a long time to come but I have also read about how short lived these fat boys are. Coast is always a factor for me. And John, I would NEVER laugh at you only with you. You crack me up and have provided many good moments. You may take this post with a grain of salt because I rarely know which way to turn.