I personally would add the 2 more archons and take 2 battalion detachments.
If you do the following:
drop one squad of Kabalite warriors and one raider,
Swap out 3 of your DL for dissies (your choice whether you do 3 of the raiders or one ravager)
Swap out the Husk blades on all archons for venom blades
This keeps the flavour of your list intact (only one less KW and one less raider), makes it 2 detachments, and buys you an incremental 10! CP.
In my mind the 164 points you're paying for the 2 additional Archons is well worth the 10 CP you get from it.