Sounds to me like your 'handling.meta' centre of mass is too low


<vecCentreOfMassOffset x="0.000000" y="-0.120000" z="Raise This Value" />

Raise the 'z' parameter by ~0.5 increments until the body roll starts acting how it should (ie starts tipping over on corners. Front raises under acceleration etc) & then edit in smaller increments (0.1, 0.05 etc) up or down until you get what you want