I used to run 30g of weight on top of my servo but removed it.
also had the RDRP motor weight which I'm also no longer running.
I found that for me having any weight in the car would cause either over steer on the front or tail end kicking out at the back.
even without the weight though I was always having difficulty keeping the back end as planted as what i'd like. but since sticking the shocks on the back it seems to have sorted all my problems.
I'd suggest trying this, as it may also shift a bit of the cars natural weight further back. its also the configuration that the yok has.
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