>>529726702
Lightning dots don't really do anything to them and I've tried the setup on Kineticist, Fallen Reverend and Striker. Once you cap their other res and give them a bit of armor and they're good in 99% of 8mod T16 mapping situations. Give the shield mercs a Shaper %life on block shield and they'll survive most T17 situations too. You can also give em a Defiance of Destiny but that's kinda overkill imo.
The only time you really need to use the summon command is if they stand on degens that turn off recovery like the Exarch and Sirus ground effects