Think you missed a key part of my question…. I burned in (welded) sliders too far forward by .75”. If there isn’t an easy fix like a custom set of rear section splits, then I will have to cut off the sliders and re-weld further back.
I’d just re-do the sliders. Changing the spring segment lengths will also change the launch characteristics, the shorter front section on the Mopar springs is one of the reasons they don’t axle wrap as bad as the other brands with symmetrical spring segment lengths. And if you shorten the rear section (which would take custom springs anyway) you’re reducing the advantage built into the factory design.