Actually with a full Echo buff it may be advantageous to NOT stack on plumes since unless you're grossly undergeared you should easily survive a single plume on any job. Not much you can do with a Landslide though. What's been getting me lately though is groups that despite a full Echo buff STILL can't break a gaol in time or push heart phase at or before the circle bomb drop. How do you fail to do with a 20% buff what many groups could do with NO buff? Echo is breeding complacency.