Spells we've tested since:
Exuviation: 640CE
3rd party pull, we both opened with a dispel (since exuv is self target)
BLU cast exuv, on BLU
BLM/RDM cast 2*dispel, hate on BLM
BLU cast cure1, hate on BLU
Exuviation hate is fixed like cure5, it doesn't matter if it cures the target (yourself or party member during diffusion)
Saline Coat: 1CE
3rd party pull, we both opened with dispel
BLU casts saline coat, hate on BLU
after 5 seconds or so, BLM casts Cure 1, hate on BLM
BLU cure, hate on BLU
Jettatura: 180CE
3rd party pull
BLU Jettatura > BLU
BLM Sleepga > BLM
BLU Cure1 > BLU
BLM Cure1 > BLM
Actinic Burst: we only got a range, more than 180 but less than 320 (people needed to sleep)
Diffusion itself is 1CE (both dispel > BLU Diffusion > BLM Cure1, hate on BLM)
It directly multiplies the hate of the spell by the number of people it hits.
3rd party pull, we both dispel
BLU diffusion > BLM Cure1 (equal) > BLU Exuviation hits 3 targets
BLM casts Dispel * 6 (1920) > BLM
BLU Cure1 > BLU
Personally, I vote for CE and VE
edit: one other interesting thing - /healing does not add CE. We were sitting at a disparity of 1 (BLU 1CE over BLM). I sat, and the mob would continuously switch between me and him, every "tick" it would face me, and turn back almost instantly. This means that resting gives VE on a tick per tick basis, and the VE gained from healing dissipates before the next tick. It also means that healing does not give CE, since if it did I would overtake him and the hate would stay on me.
edit edit: more testing on the healing enmity. Since we now know that healing has no CE, it should be possible to reach 0 TE again. Party member pulls mob (Young quadav) with a melee attack. I /heal for a couple of ticks. He warps. Mob stays on me, despite zero CE and zero VE. So once you are on a mob's hate list, you cannot get off it, even with 0 total enmity.