I had lead between the cells and foam - so there was still some 'give', but not a whole lot. I found the brass weights alone (or about 50g total weight) to be enough for me. I found the extra 50g didn't really help and I took it out to gain a little speed / put less stress on the motor.
My car absolutely flys. I guess the more you add to the rear the easier and more stable it might be (to a point) but the brass weights are enough unless you're running superlight lipos.
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