Make sure you have 16 death magic for the longest lasting minions.
If you're having real trouble maintaining minions, go elementalist secondary, and use verata's sacrifice in conjunction with glyph of renewal, which would allow you to keep recasting veratas every 15s and have it constantly active.
About the minions moving around, if you stay in one position for too long, they will spread out in a circle around you. If you move slightly, they all cluster behind you for a few seconds before spreading out again, which is plenty of time for a BoM or veratas. Keep shifting your character around slightly and they'll always stay behind you, with most of them getting the effect from a BoM. If your minions are fighting, they won't come to you until there's no longer a target for them to kill.
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