MaysEffect

To add to Rusty's post. Both wheels on the axle need to be either fully unloaded or loaded when you disconnect the endlinks.

The bar orientation makes a slight difference as well. The arm angle should be as parallel with the ground as possible when at ride height. you may need to modify the perch levels on the coilovers as well after making changes to endlink preload. Most of this should be done by a pro shop if possible.

Trouble shooting in a garage may give you a massive headache and not really get you any closer to properly fixing the problem.

Excuse my pessimism.