Ran Joels setup from the ETS last night - started the car with it exactly as per the setup sheet except I'm running 13.5 at our track - quite a tight twisty layout but with reasonable grip. Tires were Sorex 32's. Additive was JtG. I don't use LW shells for club racing so it was a std weight Mazda6. It was at my track which I know like the back of my hand lol.
I constantly was breaking the driveshaft blades in the spool, nearly one every run. I removed the spacers from the front arm mounts - which narrowed up the front track width, and the problem went away (anyone got any other advice??).
As well as narrowing the front, throughout the night I removed the rear roll bar, moved the steering links forward on the bellcrank, and switched to a Speed6 shell. Was very happy with the car by the end of it.
Additive times were 20 mins on rear and 5 mins on front (both full width).