Okay, so here's my suggestions as possible alternates:
/Traps should change its t9 'suicide bomber' power into a buff. You throw it on your summoned minions like the upgrade powers, and then when they die they go bang. None of this trying to guess when you want to trigger it in the vain hope that it will be in the right position at the moment it goes off. To help keep it balanced, the damage dealt is dependent on the minion in question. Small minion = small damage and small AoE, scaling up at the higher tiers.
Suggestion for Serum: make it an AoE aura, like an Empathy aura, that buffs all your minions at once, b ut not as strongly. That would be way more useful i think.
Alternate idea for the Nanite Heal for Bots: make it a toggle that summons two little floating drones, like the Seeker Drones. The drones then automatically zap nearby Bots with a healing ray every once in awhile. Maybe allow them to heal the MM too, but at a reduced rate, and only if the bots are healthy. If you want to get really fancy, maybe expand that out to healing your allies too (again, at a reduced rate, and prioritizing the bots first).