I think I would take the Swarmlord out and replace him with a walkrant with
AG +
HVC. Take one Warrior out of each squad and place them into a new squad and add one. You still come out 5 points less than having the Swarmlord, for an arguably more versatile list.
I like the Swarmlord on paper but he's extremely one dimensional (and expensive), especially with the Tyrant Guard with him. That's 360 points dedicated to
CC, and not super mobile (unless you choose a Hive Fleet like Kraken or Behemoth), so they're only really getting involved on Turn 3 most likely. In my opinion if you want to abuse the bodyguard rule, it's best done with a shooting unit that can sit there and pick things off with impunity. A walkrant with a
HVC or even one of the relic cannons does this very well and, with the Exocrines behind him, helps to shut down large swathes of the board. On the flipside, what scares the opponent about an un-targetable Swarmlord in the open? He can't shoot them, just glare angrily at them
With regards to the rest of the list, I like a lot of it. My only question is why Raveners? Again, quite a killy unit in
CC, which is great, however they actively discourage you from taking ranged weapons and they're not super survivable with that 4+ and especially in 3-man units. I feel they're the kind of unit that will annoy the enemy for a turn after
DS in but then get quickly obliterated. For that 180pts you could take another Exocrine.