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The issues is cheap coilovers + heavy wheels + really short sidewalls + old floppy chassis.
Cheap coilovers will not damp the bumps as well. Heavier wheels will transmit more motion to the chassis than lighter wheels. Really short sidewalls absorb less impact than taller sidewalls. Old floppy chassis means more of the impact motion gets transmitted to you rather than being absorbed by the suspension. Your Sentra probably has a much stiffer chassis, so it absorbs the bumps much more smoothly. Invest in some seam welding/chassis foaming/chassis bracing.
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