The mod I remember is...
Run the rearward front mounts from a XXX-S which straightens the pivot pins, and then flip the wishbones front-back. The woshbones require lower shock mount holes drilling.
By running the XXX-S blocks you straighten the pins, but in the process also shorten the wheelbase. By flipping the arms you get back to something like the original wheelbase.
Ran this in conjunction with the extended steering arms.
(not that we'll be going back in the near future, but this set-up was "chank" on the dirt at Tiverton.
)
Also try XX4 shocks on the rear as they seemed better over the bumps. You'll need to double check the driveshaft plunge as it's close to coming out of the diff half. Easily fixed by running different CVD axles or bodged by shimming.