[Nonfractal]

Jeremy ,

I see you haven't installed the hall sensor yet, A critical component. 
If the hall sensor is not installed working properly, you will skip laps on the counter (and every lap matters)
Get this sensor as low to the track as you can
Ensure you install the right way up.

Install a fly lead LED emitter whether you think you need it or not. It's a useful backup when the main LED gets dirty or the chip is dislodged in an incident. Install that LED with the right polarity! It's not necessarily intuitive so be sure to read the instructions.
A bad LED will impede lane change.

Read anything and everything by Tamar, then read it again...

Get the weight of the car down any way you can. Lightweight axles, wheels, screens etc. 

Ensure you have the kit to hand to lengthen the ratio. 

Get spares: chip, hall sensor, led emitter (and controller cartridge if you can )

Hope these tips are useful.
Alan

PS take that magnet out