You need to have the MT dial set to 1 to get the MT to export at 'full strength'. Other then that, it looks like your method should work fine. Something of a dilemma here if the MT is actually made up of several targets. Since the exported .obj is the result of all of the selected MTs you'll only get a single dial when you import it. You can export each one seperately by setting one of them to 1 with the rest set to 0 then cycle through the rest one at a time this way.