Hmmm. Just got funny idea on the Myrkwyrm. It's fast, it's extremely manouverable, it's agile and it has ram3. Oh and it's ridiculously cheap. Look for around 7 of these buggers for every destroyer
With the speed and agility swarm of those should be able to outflank enemy into sector where they don't face that much firepower. Then simply ram the enemy

In mass!
Agile helps a lot for hitting and 3 of these hitting takes out destroyer without even criticals...
Sure they die of somebody says "boo" but being about as cheap as they are you aren't really that bothered if opponent wants to spend time shooting at them rather than your real ships and even just couple that gets into position...And with you having 7 of them(oh and you'll be init-sinking your opponent big time

) you can afford to lose several and you still have threat he cannot ignore. 50-50 on getting critical plus d6*3 damage is never a good thing.
Dreadnought requires 8 hits without criticals to go down and faces 20 of these buggers...As you can't split AD between ships he could get swamped real fast!
Hmmm...How much do these ships cost in money? I think I'll get suicide squadron or two of these
Guns...BWAH! Let's use the ship as a weapon instead
Though I admit there's something to be said about swamping target with boarding parties too. But ramming takes out ship faster(plus it's so fun to yell "GIVE ME RAMMING SPEED!")