I kind of agree on that one. Rolling twice mechanic seems nice until you have to do it 8 times in single strike. +1 might be a bit stronger overall, but is surely simpler.
Mortalis for 300 points in all variants [with 6 torpedos] seems like a good idea, too.
If succubus would have 2 lances for 140, I'd leave 4 torpedo variant as it is. 3 torpedos, even at lower cost, would be inferior option to 2 lances in nearly every case.
I'm not sure about Impaler Succubus, too. With single Impaler it's armed only a little bit stronger than a Corsair while being worth more than a double price. 2 Impaler corsairs have roughly the same resilience [same hits, more shields, less armour], more weapons [2 less batteries, one more impaler] and cost less. Also, they allow you to get more capital ships, while Succubus eats valuable slot.
So I'd give Succubus 2 impalers (for 150?).
And as I'm already in analysing Succubus mode, what's left is a carrier version: Other fleets show that light carriers tend not to work. And I don't know who in their right mind would waste DE capital ship slot on 2 launch bay light cruiser. This thing might need work. Or remove variant altogether as it doesn't seem to perform any function now?
Removing it would also make its weapon loadouts look nicely compared to the torture: half the batteries and full strength on secondary system in every variant.