Incubi have no grenades, and ghostplate armour is all but useless against power weapons. Drop the huskblade for an agoniser (or even VB or standard PW) and get a PGL and shadowfield. Demiklaives are nice, but my preferred upgrade is onslaught, mathematically it works out a little better.
Dakkaborn are nice, but if you run 2 and 2 and The Duke instead of Lelith, wounding on 3s vs 5s (on average) is much nicer. (granted Lelith does ignore armour) 3 Trueborn with blasters is a more standard option, but its all about what you like really.
Mandrakes. Much maligned, but they look cool.
Are your Kabalites getting into CC? then Drop the PW at least. If you are going with the dakkaborn I would swap out the Splintercannon for a Dark lance as well, especially if the goal is set up on an objective. Yes you lose 4 or 6 shots wounding on 4's but str8 insta kills most things, and you are running two Venoms so 24 shots each there, plus if a hellhound is bearing down on you an extra lance shot can really help. I get the enhanced Aethersails for late game objective grabs, not my taste but there you go.
Blast pistol on the Hekonizer is all but useless, you want to get them into cc asap, so fleet moves are usually the order of the day. If you insist on Lelith, drop the agonizer for a Venom blade, overwhelm and let Lelith's ridiculous number of attacks give you your cc winners. Hydra gauntlets are my second favourite wych weapon, behind the S&I, two of which are great for Dreadnought lockdowns.
I like the ravagers. They will be shot at right away, as long as you expect it let them rain death as long as possible and move 12" every turn if you can; just to rub in the Aerial assault rule if nothing else
“If an injury is to be done to an enemy, it should be so severe that his vengeance need not be feared”
- Archon Niccolò Machiavelli