Line lock or leave as is?

Yes the 2 step was definitely a life savior. I was so pumped up being my first time racing my Dart that I had to use the two step so I didn't just dump the clutch at 6k rpm every time.
I get the idea of a two step but that would be one more thing to add for just those couple of track trips a year. I don’t run a rev limiter at all at the moment.

I agree though that it will take some practice to find and be consistent with a launch rpm that works best.