[quote=@Beach Burrito]
Pretty much done my NS, just have to put in a bit more on their history and do their outlook. That and explain why their ships implode when their reactor is breached.
[/quote]How about using controlled mini/micro singularities as a power source?
Because of the methods that keep it stable remain for several seconds even after the engine's destruction the black hole consumes your own ship and then to whatever warp/hyperspace mechanim it simply pops out of existence instead of violently evaporating.
Or you can use some more abstract kind of singularity which pops out of existence and dumps the ship's material along with itself to hyperspace/subspace/etc as part of its natural mechanism.
Said exotic singularities are easier to control (once you know what you are dealing with) thus preferred over any kind of black hole engine design.

In spite of the fact you usually only find black hole engines in ridiculously powerful things for sci-fi, they are actuall quite tame and a reasonable method to power warships in the future. Actually the essence of how black holes evaporate makes massive black holes as the power source rather impractical unless you use plenty of space magic/handwavium.