I am also starting to redesign as a coven army with minimal Kabal support.
My thought is, RRD/CAD with ravagers, reavers, and scourges to give you some much needed AA. I also like medusa and beast pack, im gonna give them a coven-esque look and expand on my haemonculi's creations
As for pure coven, it'll be hard if you limit yourself to three detachment/formations for ITC. CtC & DA are an option, but people say that costs too much. Perhaps try the wrack formation thats 30 wracks, with DA. Turbo in the wracks and WW in a cronos?
“No. Stop. Don’t go in there. You’ll all be killed,’ Motley murmured sardonically”