Could it be a bent chassis? Accidental or otherwise, your list indicates that you have changed all parts pertinent to alignment and yet you are not even coming close to a ballpark figure, how about a body shop with laster alignment equipment has a good look at your 300D body.

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99 Gurkha with OM616 IDI turbo

2015 Gurkha with OM616 DI turbo

2014 Rexton W with OM612 VGT