Process To Find Villian/Population Exploits through HM/PT4 / Hand Histories

Hey everyone,

Currently in the microstakes on Pokerstars. Does anyone have any "home work"/ study guidelines on how to filter to find specific exploits vs. villains or population?

I review my sessions, but there are three absolutely horrendous villains that I face regularly. I'm beating each without any specific exploits other than hud stats. But I'm curious if there is a process to do a deep dive on a villain or the population.

Thanks again