Level 25 uniques are starting to show up more often now that a good amount of people hit the level cap already. (I found a level 25 unique scythe and sword myself) Spamming runs with a party in Abandoned Wing or Bathhouse usually does the trick.
And yeah, getting SSS in later dungeons while soloing gets harder. I usually end up just dying and using a Res scroll to reset my hit count otherwise I end up with B or less.
Now if only there were more soul pieces...