The basic problem is that the all body muscular morphs (Bodybuilder, definition and Amazon) produce a body with all muscles flexed at the same time (which is pretty impossible). It needs the individual muscle morphs - which are coming, but haven't been released yet. At low levels of the all-over muscular morphs, you then use those individual morphs to flex those muscles that should be flexed in the pose; at high levels you use the individual morphs set negative to unflex the muscles that shouldn't be flexed, like the triceps in your picture.