Thanks for the answer!
the only unit that could concievably be dropped is the dread, who i feel should be doing enough heavy lifting to have earned his place in your list; multi wound, high toughness and volume of fire makes the dread a real MVP....
I also think that the dread is something that can be changed. However in a low-point game, having a model that attracts heavy fire and drive some attention from the corvus can be useful....
you need to drop maybe the bikes
Yeah, this is also a good point, but i think that bike can give some badly needed mobility that a foot kill team can't provide, and they have the same amount of wounds.
A part from the corvus, the captain and the first frag cannon kill team i'm not sure about the rest of the list