You pretty much have the 2nd best option after Nemesis / Slave as i see it. That should be sufficient anyways, the only reason to get an upgrade is if you care about maxing out your gear before it's going to be outdated in 2 months. In terms of damage it lacks about 200 R-ATK behind which is rather signifcant, but by far not a mandatory thing, especially considering most of the high-end gear options in this game are pretty much overkill for the content they are meant for, depending on what you are doing of course.
We don't have many sidegrade options at the moment so it's rather linear.