Not necessarily. Destroyers have more room for drive gear and so might be able to better stablize their own subspace tunnel. Most people associate stablity and shipsize but that may not be how it works. Larger ships might even have it easier.
i thinks its to compare to a ship on a river and the waves that they generate.
if the ship big, the waves are big and damage the embankment of the river more as a little ship with not so big waves, if it drives slow enough.
i believe that all entry in subspace and left the subspace, the node itsself feed with energy.
greater ships need a greater portal, thats mean you need more energy.
if you feed to much energy in a time-periode in a node he will collapse, like as the lucifer exploded inside subspace or the measonsbombs.
going a corridor more unstable so its the energy that you need to make the node dangerous for travel is much lower.
so i think thats reason why the shivans can use nodes they are to unstable for gtva.
their subspace engine release much less energy to the node so that they can use it.
my final theory: to beginging the system is balanced and theres no energy influence but without the energy influence theres no subspace travel.
now its beging that normal gravities flow in the the system and the node will build.
the nodes end are like the mouth that eat the gravity.
if the level of energy/gravity on a to high point, the system will collapse and the mouth close.
now beging the energy in that system to sink, if the level low enough the node will open again and energy flow in.
now it cames with the subspace engine: the engines feed the node with more energy as it normal get of the universum.
so any day of any node will reach the maximum of energylevel inside and go unstable/close, until the energy is goging down.
maybe thats make the knossos.
its not take energy inside the node, its suck energy out.
i think you can compare a open node with a drift of the sea where the water flow to a point with less water, like bay with a small opening.
i hope that you can understand the text, because my english isnt so perfect and in the past i often write some missunderstanding posts
@Mad Bomber: thanks for the flowers *g*