Is there a particular reason why you're choosing to use 6 channel mode over 7 channel mode? I just really don't see any tangible advantage of using 6 channel mode over 7 channel mode? Personally, I like having a dedicated dimming channel.
Of course, it should be rather obvious I'm advocating 7 channel mode. But, check the latest downloads of profiles to see if a 6 channel one has been added.