Don't take Kroots if you care about having a strong list. Damn that hurts to say but it's the truth. Just take Firewarrior or more Drones instead. Cheaper and do more for their points. ^^
Something else that's interesting here is that you have half of your army that's more or less independent of Markerlights. The Drones are Drones and will die quickly to protect the characters anyway. The Commanders all have BS2+. The Riptide already can re-roll 1s on its own. That leaves the Broadside who would love to have some Markerlight support, tho even that one gets +1 to-hit against targets with FLY keyword so there's that.
Just invest another 380p in Firewarrior with a Markerlight on each Shas'ui and you'll have a lot of ObSec mass, some more Markerlights and lots of screen (50 models) for your characters. Then you still have 500p left to spend in a 2k list lol
I sadly concur, you take kroot for utility not for damage output and any list with The Eight is already short on raw damage output. You need to be filling out the list with things which will both generate CP and dish out damage - so Fire Warriors and Cadre Fireblades. Any other serious firepower may as well be on Commanders, you can either leverage the character keyword to win or you are pretty much getting trashed anyway.
I dont hate kroot competitively, they have their function. In a list with the 8 they have some value to move further forward turn 1 and expand where your commanders can go.
Not saying they're better than other options but the utility is worth something