DMXEdit treats my corrective flexes as absolute. How do I stop this behavior?

[GreyGeist]

Hi. I've recently finished sculpting the corrective flexes for my model in blender. However, they are relative instead of the absolute flexes that DMXEdit expects (e.g. JawOpen_LipsOpen doesn't drop the jaw and open the lips, but it moves vertices to make those two flexes work correctly together.) What can I do to fix this issue?