Why not add the lead weights to the chassis instead of adding more unsprung weight to the arms?
errm...i got the theory, spread weight have lower Cg...like M03R, the alu rear upright help with the Cg of the car.....cos i have race with a lighter M03R which would NOT traction roll at corners..even sharp 1..
now i just need to reduce the weight to make if faster...
fyi, i an running foam tyre on asphalt. the foam its about 2 mm thick.
please correct me if i am wrong.
just my 2 cents.....

peace