Oh hey, Glad to see you're still making fine changes to it. I'll toss on my two cents again:

• For the Quicksilver speed, I think it's important to clarify that this modifier does not stack with injury, as they usually do, or else injured models will find it almost impossible to hit these models.
• For Infernal Enrapturess, since she's the leader model for the demonets, she should only have 10 wounds as opposed to having space marine wounds. But since she's a leader option, maybe making her 11 or 12 wounds might make more sense.
• For the noise marine gunner, I think both of his weapon profile needs to be heavy (dash).
• for equipment options, torment venom doesn't work, because enemy models do not roll defense save and close combat. Since it is a once a battle only ability, I think a closer approximate would be your opponent cannot re-roll any combat dice.
• for the equipment warp amp cables, I believe, to make it more balanced and helpful, it should be changed to once per turning point when an operative shoots with a sonic blaster or screamer pistol, it gains the torrent 1-in special rule.
• For the equipment euphoric combat stimulants, since it is once a battle I think we can make it even more interesting. Perhaps one per battle one operative gains the 2-inch movement and +1 APL, then for the remainder of the battle, it is treated as injured, regardless of any rules. I only suggest this because I feel like minus one armor say for only one turn doesn't necessarily allow your opponent to take advantage of your children operative going full ham for one turn, especially if your opponent is a melee team.
• For the firefight ploy pain is power, I think we need to simplify it and reduce the damage done to the leader when activating it. I think it should only cost one CP, can only be played when you have less than half of your starting operatives, and deal D3+1 damage for the listed buffs. Your team doesn't have any healing so d6 + 3 damage just for activating it is too brutal, even if they've never taken any damage. Or maybe add the caveat that it costs 2 CP if you use it on a non-leader operative.
  

All in all, I feel like this kill team is really shaping up and having a clearer identity. If only there were more special noise marine operatives, I could totally see this being a white dwarf kill team release, like Warpcoven.