The concept is simple. Just lure Mobs first and then use Zombify on them. The others are adaptation.
The easiest Mobs are the aggro Mobs with only Malee attack. You can walk pass them and them will follow you. Let them follow you. You can have about 5 Mobs follow you at one moment because of the max aggro. You can lure 5 of them into some Mobs that stand around and then place your Zombify. With Hexing and let your zombies get the last hits, you can get 7 - 10 zombies from one Zombify - if your zombies get the last hits on Hexed Mobs and the Mobs are also standing on Zombify, you get 2 zombies. After that some Mobs also spawn around your Zombify too, take you chance to lure them into the circle to get more zombies.
Some Mobs have range attack. These Mobs make me think a lot. The way is moving the target of the Mob to the other side of Zombify, so the Mob will walk into Zombify. If the Mob’s target is you, just walk to the other side but if the Mob’s target is a zombie, then use Tet Mamak La. Some time Mobs will stand in a group of 3 or 4 near each other, just put Zombify and Hexing on them to get 5-7 zombies. Some time, I just Hexing them and let my zombies hit them and move on to save my time.
Some Mobs always move around. These Mobs always runaway or move to find Healing. You have to use Bwa Kayiman to stop them. The thick are timing. If you use Bwa Kayiman all the time, you will lose your DPS. If you use Bwa Kayiman to finish the Mobs, you will not get zombies from Hexing and zombies last hit. The best timing is when a lot of those Mobs lower than half HP and stop when all of them near death to let your zombies kill them but not let them have too much time to recovery from knock down and start to run.
The other thick is using Hexing and zombies last hit as much as possible. Even you have max number of zombies, the new one will still born with full HP to replace your oldest one.
Finally, use Zombie Capsule when you feel really need more zombies in your army.
There are some ways to use Zombify more effective. You need to have imagination and experience it.