Minion Instability Synergies
Elemental Equilibrium (EE)

Combine Minion Instability with Elemental Equilibrium to Path of exile currency further increase the damage of your explosions. Since the minion explosion deals fire damage, you can stack cold damage or other elemental effects to trigger EE's bonus damage when enemies are hit by cold or lightning before the explosion.
Fire Penetration

Since Minion Instability causes fire damage to enemies, using Fire Penetration (via a gem or passive) can reduce the fire resistance of enemies, allowing your explosions to deal even more damage.
Pride and Anger Auras

Use Pride to reduce the enemy's physical damage taken and increase their damage vulnerability to buy Path of exile currency your explosive minions. Anger can also boost fire damage, further increasing the explosion damage of your minions when they die.