Just wanted to note, Hell's Fang and Gauntlet Hades follow-ups have lost their primer breaking status, so RCing them usually will just lead to mix-up and continued pressure.
Jin also still gives Ragna a bit of a hard time in the air, so keep that in mind for offense.
5A and 2C into 6B are becoming more and more used, but 6B is still 24 frames, so in most strings (with the exception of off 2C or off rapid cancels), you can 2A him or grab him out of it. Learning to react to it will help a lot, because a good chunk of our damage comes off of it, and our mix-up otherwise is pretty weak.
Also watch out for the 3C > 2D frame/jump trap. That's a gatling many people (Ragna's themselves included) forget exists.