what am i doing wrong?

I think we're missing something here.

I'm assuming the dyno results are from an engine dyno, not chassis.

That said, what is different now that your in the car?

1)air quality? What are the under hood temps? Are your hood scoops funtional, or just for show?

2)fuel system.? Are you using the same one> Perhaps your losing fuel pressure? A friend of mine had problems with a car running mid 13's that should have run 12's. Only took one pass down the track with a fuel pressure gauge to find out why.

Pressure dropped to 0 by 1/8 mile. No miss, no stumble.

Upgraded the fuel system, and brought his et down.7 with no other mods.

Just food for thought...