Yes, the fuel system technically could handle more air, but the tuning system doesn't have the ability to control the stock injectors any further. There is a limited percentage change you can do with the FI/C piggyback on the car and we hit the limit, thus the relatively choppy A/F ratio. What you see as the final result is an improvement over the way it was running/tuned when we got the car. Also between the stock direct injection, stock port injectors, and the after market methanol kit, it's not that easy to coordinate them all together.
Not exactly(was lean in spots and rich in spots), but I'll see if I can grab some A/F charts of how the car was running/tuned from the get go. Also, you have to remember fuel is not the only thing that was tuned, timing is also changed and then you have the methanol injection kit over the top of all of it(which as mentioned before is not running as intended due to progressive controller controlling it).