Yea the first few don't really need to be stunned as it's just one Eruption.. I try to save stuns for the nail phase so people don't have to dodge while killing nails, and then after the nail phase where there are a bunch of eruptions and they are harder to dodge. It is a pretty boring role as the stunning OT, however you are likely just a few pieces of gear away from being able to solo tank it, then you get to have all the fun lol