OK.
I would use Jetbikes as 3-9 with either heat lances, blasters (tank hunting) or cluster caltrops (infantry harrassment).
5 is a number that doesn't take advantage of the options available.
HOWEVER, what's more krooty ( and better in 6th ) will be squads of Scourges ( Winged Kroot ) with Haywire Blasters.
And I'm thinking possibly a mixed Coveny force might be more krootish.
Sliscus > Kroot Shaman.
Haemonculi > Kroot Master Shapers.
Trueborn > Carnivores with fancy guns.
Grotesques > Really Beefy Carnivores / a Smaller Krootox varient.
Wyches > Assaulty Carnivores.
Wracks > Beefy Carnivores.
Scourges > Winged Carnivores.
Beasts Squad > Kroot Hounds + Kroot Beastmaster (Shaper?)
Bikes > Kroot on Pterodactyls.
Talos > Krootox.
Razorwing > Some sort of GIANT flying dino thing with Kroot crew manning guns.
Raiders / Ravagers > Some sort of Knarloc?
But either way...
I would run a Haem (boasting a liquifier gun) with each of the Wych squads for the
FNP.
The Raiders want to just have the Flickerfields and maybe the Aethersails (I'd be tempted to run Shock Prows in a Kroot List doubly so). I'd also probably be running the Raiders with Dissintegrater Cannons at this points level as a means to take out termis.
I would honestly not bother with Slicsus at this points level and just have the 2 Haemonculi. OK he gives everything deepstrike, but you're only actually using his Drugs re-roll in this list, and he's using 15% of your total points in 1 model.
Personally, I would do the following list:
2x Haemonculi with Liquifier Guns (Shapers with Acid Guns) - 120pts
2x 3 Kabalite Trueborn with Blasters (Carnivores with Blasters), mounted in Venoms with an extra Splinter Cannon (Tiny Gnarlocs / Larger 'dactyls?) - 244pts
2x 7 Wyches with 1 Wych Weapon, Hekatrix with Agoniser ( Carnivores ) in Raiders with Disintegrator Cannon and Flickerfields. ( Knarlocs? ) - 360pts
2x Ravagers with Flickerfields - 260pts
This is 994pts
It's also 6 vehicles, 6 Blasters, 4 Splinter Cannons, 2 Liquifiers, 14 Wyches, 2 Dissies and 6 Lances.