They are doing something - it is just that they are not strong enough to lift the weight of the suspension arms on the opposite side without flexing.
Run the hardest Tamiya bar (Blue/1.2mm) and it will lift the other side - the Yellow and Red bars don't.
Disconnect one of the bars and you will notice a difference in the handling balance. I would generally avoid running the bars if at all possible as they affect bump handling, however on a grippy/smooth surface they can make the car a lot more settled.
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