Healing to keep pets alive is ok at lower levels, not so much in mid levels and no way in hell does it work at max level.
With a huge amount of recharge you can keep 4 targets under fortitude. 3 in general, 2 at low level.
I personally do not like that. If you are going to go through with emp then your best bet is ranged pets
most mercs like to stay back. Commando likes to march in with his short range flamethrower. spec ops i treat as melee because they have no cone attacks and they get a rifle butt attack. 3 fort targets right there
same with thugs. arsonist goes in for firebreath, bruiser is melee
also same with bots, assault bot flamethrower, and prot bots do not have a cone so i send them into melee + their seeker drones go off more effectively. a prot bot in melee summoning seekers on themselves vs seekers coming in at a range and exploding on the edge of a group. another 3 fort targets
I got more mileage out of Thermal with demons, thugs and zombies. the 3 resist auras IOs are required to not die instantly. Demons natural resists + IOs + fire shields