Like I said, the 500 1.4 and Panda 100hp felt like different cars to me. The 100hp handled like a go kart and felt very keen and the 500 just wasn't as good in either way.
although they share the same floor 500 is a euroncap 5 star car whereas panda is only 3, all those extra beams and stuff probably made front havier. you can easly tell the lack of balance between front and rear just by looking. (at least I can) so, that may well be one of the reasons.