@Lowender, do you not think the improved handling is more down to the tyres and having a lower profile now? Up to a limit the lower offset and hence wider track width should be better for handling I would've though.
Partly due to lower profile yes, but the steering feel is better and doesn't weight up so much (I have a depowered rack) and the car turns in sharper. The car is designed to have et42 offset, the steering geometry (scrub radius, Ackerman angle etc) is set around this figure. Whatever, it's an improvement to the way the car drives.
That's interesting and yes I'm one of those that totally ignores/doesn't think about scrub radius or ackerman angle. In my simple eyes wider is better!
My road wheels are a much higher offset (not exactly sure what tbh) and the steering is much lighter than my track wheels but the car does feel more planted with the lower offset wheels, the tyres are too different to compare properly though.
It would be interesting to take a high offset wheel and incrementally add spacers to see what is "ideal" - but that may differ depending on use too.