I'll answer what I can SHY.
The weight in the S4 is further forward than the BJ4WE.
And I would think further back than the A-ONE, although as no-one has seen a production Aero and have no real idea what the parts will be made from my summation is pure guess work.
The 3+3 battery config was considered, but in the opinion of all concerened in the decision making the disadvantages outway the advantages. 3+3 moves weight further forward and forces the need to move the centre driveshaft and slipper/spur higher to go over the cells making the CoG higher and raising up the rotating mass.
The XX4 handles bumps in a similar way to the S4, though I find my S4 is more predictable across high speed bumps than my XX4 was.
Yes' we do find the S4 more difficult to grip roll, in fact I find I can run mine higher than I would have run my X5 without having to worry about it falling over.
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