RPM not wanting to rev/ throttle issue? Calculated Airmass table?

Hello Forum,

I recently came across an issue where my car will not rev high. At first, I had a P1518 code which I cleared and it hasn't returned since, but my car will not rev past 3500 RPM and when I put the pedal down it feels as if a 2 step is kicking in. I have the car tuned, so could it be a tuning issue? Maybe something to do with the Calculated airmass table? Or a bad TAC? I recorded a clip of what I'm talking about here:

https://www.youtube.com/watch?v=E3f0ibmhkkY

In this clip I'm holding down about half throttle or where 4500RPMs would be but it wont rev any higher.

Here is an attachment of my tune.

My car is a 2002 C5 manual with an LSA supercharger full exhaust. Let me know what you think!

Thanks
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