[SoloPierre]

As a general rule, a stiffer front swaybar makes the car understeer more due to a quicker load transfer.

But it is not always the case. It has to do with the camber curve of the macpherson strut suspension.
We gain negative camber as the control arm moves towards horizontial. after the control arm moves past horizontial it actually pulls the bottom of the front tires inwards (loses negative camber).

The stiffer front sway helps prevent the suspension from compressing past the point where the front control arms go past horizontial and you start losing negative camber.

The load transfer effect can lose out to the extra benefit of better camber curve up front.

I just wished we did not have a strut suspension in back and had a multi-link like the 911. Dynamic toe during compression and rebound in the rear sucks...