Let's start with the Praefect - the Corsair cruiser.
The ship is quite big, even for a heavy cruiser. Yet it doesn't have significantly high armor or other significant advantages. Even though it has a very low - one of the three lowest, significantly lower than all the other (~10% lower than the next lowest) - turning speed. It'd make sense to buff this up to the Vidar's turning speed at least, just to balance out the cruisers a bit better.
The Storta - the Outcast Destroyer - has the same problem, its max. turning rate is the same like the Praefect, while being a medium cruiser and not having any significant advantages as well, though it is quite thin. I still don't see a reason for it having such low turning speed.
The same pretty much goes for the Thanatos - the Colonial Cruiser - though it has an even lower turning rate.
Considering their twelve turrets I suggest them to be buffed to something between the Vidar's and the Coalition Cruiser's turning speed.
The Praefect was always supposed to excel with arcs. I'll have another look at its arcs and maybe buff that up to keep variety. Storta will be evaluated later.