I should've mentioned this sooner, but I had already considered this. My idea was that yes, Arcos produces many of the mightest warriors in the universe due to its insane gravity, with the weakest still being around 100,000. However it was quickly found that in the absense of Arco's ultra-harsh environments, Arcosians don't have significantly higher power-levels. While still notably above-average with an ease in controlling Ki second-to-none, the difference between 100 of Colonial Arcosians (or Colonials for short) and Homeworlders is significant.
The obvious conclusion being that Ieez and Artic are colonials.