Car runs the same

I'm not trying to be a smart azz and l don't know much about drag racing ( been a circle tracker all my life) but try changing the driver.
Let another (good) driver make a couple passes. Have the previous owner make a couple. You might be surprised as to what the "problem " is.
I see it all the time in the kind of racing l do. I have done it myself. A guy asked me to drive his car one nite. Usually a mid pack car. I won the race that nite. Track champion came over afterwards wondering who was driving the car that nite.
Not one thing was changed on the car itself.
What was changed was what was IN the car.
Just saying....