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But they are the VMaxx springs, aren't they? Slightly shortened shocks for lowering with springs (upto 30mm) will not work with the rear springs from coilover kits. Rear springs are to short.
You'll need pretty short dampers when combined with coilover rear springs. I tried some Bilstein B8 sprints (shortened) on the rear with H&R coilover springs and they didn't get enough pretension. What coilovers do you have? You should be able to get replacements from the manufacturer.