I calculated quality of competition using playoff shots for and against, which ended up being meaningless, since players don't get the range of matchups they get during the season. So I changed playoff Qualcomp to use regular-season shots. I only ran it for 2009-10 5v5 so far. The results are better than before, but not that insightful.
I wanted to standardize the stats sheets across 5v5, 4v5 and 5v4. So PP and PK sheets now have Corsi-based QualComp and QualTeam, as well as Zone Start and Zone Finish - which don't mean much on the PP.
Let me know if you have any thoughts.