A lot of the adds attack totems first, so there is always an issue of are-your-totems-down. I don't believe grounding totems absorb their spits either, since they are AOE spits. Magma totem definitely helps with adds. The problem with poison totem as well is that it pulses every 5 secs, and in 5 secs two venomspitters can do a crapload of damage -- especially if someone is unlucky enough to get spiked at the same time. You only need the poison totems down during the venom guys too, other times you are much better off with heal totems. So totem management itself becomes tricky.

I think its definitely a boss that will get easier over time, but a very hectic fight. I just hate these two instances, since minor mistakes are pretty much unrecoverable.