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Ray you don't need a new MAF Tube, you really need another tuner since no one has come right out and said this. If your tuner doesn't know (or wasn't aware of a simple table that turns off a specific parameter to stop a code that would of been a major red flag. You really need to find someone that is well versed in tuning a FI car as well as an NA one. Where are you located? As I'm sure that there is a reputable tuner nearby that you can take your car to.
I just would hate to see all the money you spent (and then some) go out the window due to bad tuning.
I agree with those who say RUN from your current tuner, now. You want someone who has tuned multiple FI C7's. You don't want someone learning how to tune a C7 on your car. That could lead to disaster.
An incorrect guess, but hey, your sales are down so do what you need to right?
We sized our MAF tube that way for a specific reason, that reason being consistent MAF readings. Which is the reason why we have sold several of our MAF tubes TO YOUR CUSTOMERS.
OP, I'm a little concerned about the tuning of your vehicle.