Just a quick one on this. Set your hull and subsytem radii inside the hull (or subsystem area on the model) as much as possible.
This will prevent the old 'how did they destroy that, the shot was miles off!' problem. 
Ow... thanks , King, Nebula, Tiqhud.. ;).. Interesting... hmmm....well... It solve several of the problem... I can avoid critical hit with that trick... I like that trick very much..

.. & I use that especially for my Negh Var or any ship that supposed to be a "Heavy" or "Assault" class..good for psycology detterent..

... Thank u very much El... ;)
However... My problem still remaining I think....
I mean .... as my ship' spec I explained earlier, when I against my Galaxy, she lose 60-75% of her hull strength (max hull strength is : 17.000), when all of her ship's aft torpedo tubes (6) is destroyed.

But it's different when I target her hull directly... It's strong...

So.. she lost 11.000 to 13.000 point when her (all) aft torpedo is hit & destroyed. But she only lost ... well... 10%... per hits... when I target her hull.

Her torpedo tube is : 6 tubes , health : 4.000 each, radius : 0.17 each, position : dead aft, all in one coordinate only, all six.
Her hull is : 17.000, radius : 0.00017. Position : Center (?). (untargetable of course).
For my attacking distruptor : 4x distruptor , damage : 400 each, damage radius : 0.2
Her shield : hmm... it's varry... but when I experimenting... I make sure the shield is fully draining.
I set my Galaxy in friendly ship, and I hit her dorsal side (shield strength 16.000) until it's completedly drained, aiming for the dorsal hull until she's destroyed for the first test, and her aft torpedo tubes for second test.
Btw.... is there any connection between hull strength damage percentage with subsystem's ?