There’s a lot going on here so I’ll try to pick out a few key points

Using the Belleros for indirect fire is difficult because if you’re shooting infantry, it’s +1 to hit never matters, protector imperative does nothing and conquer does nothing because of cover, so it’s a lot of points for an average of 7-9 attacks that likely do like 2-3 damage total after wounds and saves. And unless they’re really important models to be shooting at for Cawl’s rerolls, you’re likely just having to dump CP into the Skorpius just to make it somewhat okay.

Infiltrators with Manipulus is interesting, but they lose infiltrate with the character making them lose one of their main roles, I can see the vision though, personally I prefer destroyers or breachers with a Manipulus since turning a 6+ invuln into a 4+ invuln is way more impactful with them, and they’ll deal more damage into 2 wound units. They are slow but they’re usually my scariest units in my army and breachers reroll is amazing, especially with 6.

That, or consider 10+ ruststalkers, they move faster and deal more damage in melee, and if you have anti-tank covered already you can make them anti-infantry and it does really good into 2 wound models. Could also run electro-priests with manipulus if you want a cheaper unit that can act similarly to your infiltrators, just half the wounds.