Check that none of your shock shafts are bent and that you have equal droop on each side.
Then check for bent suspension pins etc by making sure that your suspension arms fall freely under their own weight when you remove the shocks.
Check the damper nuts and bolts through the shock mount - make sure nothing is bent or is preventing the shock from moving freely.
Does it always go the same way each time?
Other than that, make sure all 4 wheels are bolted up tight and are getting equal drive - no slipping diff etc.
I wouldn't have thought the chassis is tweaked - but I've had a bent shock shaft - not enough to prevent the shock from moving but enough to cause more stiction and perhaps slightly less droop.
HTH
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