I'll have to sense check a few things and maybe tweak the methodology.

As an example: of the 93 Fire Giant Warriors collected (the most deadly combo) they had a total average of 80 PK wins. Stripping out any over 100 removes about a third of them which would really skew the data away from this genuinely powerful combo. However stripping out any extreme outliers such as Blitzenturt, Hunsobo and Igbah (all near 400 PKWs) may give us a more real read.

One thing I was hoping to do was split out the average or median PK stats of each race/class/cabal/combo vs. the top tier.

The objective was to identify which classes had the highest skill floor (are easiest to use) and those that have the highest ceiling (most difficult to master). They may not be mutually exclusive, as an example Necromancers might be fairly easy for new players to pick up and get some PKs with, but a master Necromancer (aka Lich) will be in a whole other league.