Hi Kalun,
I run the Gen7 4 BBL on my 351-W and is a daily driver. Do you have a copy of your tune file you can send to take a look at? I'm not sure about the ITB set up though.
I have a friend who is a trained Gen7 tuner and he may be able to help you. Let me know if you want his contact information.
Leonard
leonardj1@mac.com