Daldaen and Speedi helped me out with some DRUPOWER. Daldaen picked out the low level ones with his wizard to make sure there were no level issues, but they are still consistently more resistant than L52 Kunark mobs.
- Charm was straight up resisted about 50% of the time, L52s in HS south or Sebilis will resist charm maybe 5% of the time
- Mez/Slow were resisted about 30-40% of the time compared to ~10%
- Charm durations were not that terrible though
Personal opinion: they resist about the same as a Kunark mob 2 levels higher.