A few questions. I definitely feel the TVD when I change it from normal to Track or Slalom.

However, which is best for straight line acceleration?
ex. The 4.5s to 60mph is achieved with what TVD setting?

is there somewhere with a detailed description on Track vs Slalom?
I have read what the TVD does but not the difference between the actual modes.

 

As far as I know, normal is balance setting.

Slalom is the more aggressive setting. Track is high speed stability.

For drag race, put into track mode. It should pull around 4.3s without much of issue.

 

I think the condition of the track surface is more important than the mode. It either has good traction or it doesn't. The TVD is for rotating the car more effectively/efficiently with less steering input.