I really like that mod. The idea of zombie/demon ship remind me a bit of Event Horizon. And that Super Dreadnought is really fun to fight against, it's surprising that the modding community doesn't make more of that kind of oversized ships, that would make great boss fight.
However those shields are pretty damn though and getting through them seem a bit too difficult to me. No, actually what really burden me is that there are no soft spot as they use OMNI shields with a 360 radius. I think it could be a good idea to let a little opening behind them (like a 3/4 shield?), it would incite the player to rely more on positioning and tactic to defeat the biggest ships. I know they are supposed to be some kind of boss fleet but actually there a nothing much the player can do save for trying to outgun those monsters, and this doesn't work very well with factions who don't rely on big guns.
Also, you should try to make them interact with the faction from Uomoz Corvus Mod as it is (probably) the most played mod.