Spells: Resists don't seem fixed at all

[Mindforge]

Following format above.

When/Where: Lesser Faydark, Nybright sisters camp.
Me: 14 Enchanter
Spells used: Tashan, Root, Chaotic Feedback, Choke, Suffocating Sphere, Soothe
Mobs: Nybright sisters, level 11? to 13

Scenario:
Get to full mana (333m w/117 INT) Pull using Tashan if Soothe not resisted and didn't agro entire camp. (Fun times)
Root mob after first melee salvo, max range, Choke. Rinse and repeat.

One out of every 8 or 9 pulls would result in me zoning to MM due to Root/Choke being resisted repeatedly. Once in a while, I would burn my entire remaining mana pool trying to finish off one at 20% HP and have to zone due to resists. This is why I medded to full mana every. single. pull.

Invited some friends to join me since I can't kill more than two before respawns. One frequents the forums and told me to check out this thread because he could see me Tashing and getting fairly consistent resists with Chaotic Feedback. One in four casts actually land. If any other details are needed, please let me know.