So it will be the quest for roll centers...

I'm pretty sure that this car also have a very low center of mass, so it means that the roll center must be lower if you want to have the same roll momentum, just a matter of geometry.

The only thing I'm sure for that moment is that with an horizontal neutral roll axis, the cas is not efficient, you have understeering and a slipping rear at the same time!
Now I have to try lower the front roll center or higher the rear roll center to reach a good balance.