Fin
I was thinking it's the fin making a high points.
Turning the car upside down;
At the front the cab pushes forward toward to mounting post/ servo housing (which is fairly broad once the mount post is removed) .. so a slotted hope would allow more give.
For the rear with the fin body - there is high point that would def lead to an inward push
Sounds to me best to not have the mount at the front and either keep the long body if you can (spread out deflection / give it something broad to bear down against) or keep the mount post in the rear in position if you've shortened the body to run shocks forward.
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