Cut one Dragoon. You're going to find piling in really weird with 5.
Cut both Arquebuses. They are not going to do much. Try to get more screening units in. You need more depth for assault matchups and more frontage for when you need to castle up against armies like Tau.
Cut one Culexus. Two is overkill.
Punchbots seem risky. I have not tried them.
Souping the second detachment is a mistake. You want the Doctrine, and most tournaments set the detachment limit at 3. Might as well make two Battalions and get rid of the Lucius, since Stygies infiltration is better for melee anyway. You're also super
CP hungry, and having 9
CP at a minimum seems a priority.
Here's 1785 points worth (sorry, I am having trouble fitting the Assassins in, but I would maybe try it with a Company Commander with the 5+/5+
CP recycling setup):
Anyhow, best of luck!