[Nonfractal]

Ballast ballast ballast,
You're going to get lots of feedback from lots racers with fixed entrenched views.
The calibra is the choice of the slot.it touring cars, easily outperforming the Alfa and Merc. 

I race the calibra at two tracks:

1. NascotWoodslotcarclub.co.uk on Ninco track and slot.it E1 tyres. Simx16 motor, all other  opponents are factory fit. 
2. Londonslotcarclub.com on painted scaextric sport track and urethane tyres, all other components are factory fit (Simx15 motor)

At both tracks I use very little ballast , just enough to temper  bad behaviour.
The car has a tendancy to lift the guide off the line so about a gram of tungsten putty just behind the guide keeps the front end in the slot.
At Both tracks I use NSR race braid. 

AlanW