Pete,
I have to agree with Doug on this one, (there I said it!).
The photos show both doors have dropped equally so the body is flexing front to rear, not twisting. All the chassis brace kits connect side to side to prevent twist, so would not address this issue.
Where are you placing your jack stands i.e. is there a significant portion of the rear weight behind your axle stands that would exacerbate the situation?
Julian
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