.....this debate will run and run! Tyres (even model car ones) are generally non-linear, as in they do not obey F = Mu*R. Prove this to yourself by putting stiffer springs on the front of your car. This will increase the vertical forces acting on the front tyres giving more front grip, right? Nope. The sum total of the grip available (side force) from the front wheels relative to the rear will reduce due to this non-linearity. The front outside tyre 'stalls' and cannot generate any more side force.
Despite this non-linearity there is an argument that launch traction could be improved by sticking weight over the rear, up to a point. Corner entry and mid corner I think the physics would 100% say that adding weight is not good.
Over bumps? Yes more sprung mass, but more mass/energy to control....
Unfortunately due to the general randomness of my driving I can't prove any of this out anyway! Have fun.
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