The way I now see it is there are 2 ways to change bump/roll steer at the rear. Caster and toe link geometry. I get the feeling that the corvette 0 degree caster spec is set as not to confuse how bump/roll steer is achieved. Keep the caster consistent and adjust the toe link as needed. I feel you nailed the solution in your first post (1,100) Quote ........"So I convinced myself that it was related to toe change as the rear goes full droop. I tried to measure this statically in the shop and did see some toe change from the target setting of 1/16" in, to a little above zero or even just a hair positive at full droop...... I feel you are on the right trac by setting a negative 1/16 per side toe in at full droop and staying the same or increasing negative toe at full compression. If you have 0 or positive rear toe, the rear will be "loose".