Agree with Rinku, +effect becomes lethal at the small ship scale.
For example your deadly gunner in a triple laser turret gets three hits with a 2D laser and adds effect. Against a PC with 4 armour you are looking at the following. Assuming +effect is just the mods (each roll to hit was exact) thats 2D + 10 - 4 armour, ave 13 per laser. Thats three single hits per laser, 9 single hits. Your one triple laser turret in one round just shreded the PC. In return even with less skilled gunners the 2 triple lasers and 2 triple missiles on the PC turned your Trader into a floating wreck. Navy gunner 3, +1 dex, sensors +2, accurate lasers +1 = +7
6 2D lasers hitting your armour 4 ship on again exact rolls will inflict 6 double hits and 6 1D missiles will inflict 2 single hits each for a total of 6 doubles and 12 singles. Sandcasters and point defence will help a little but this is still deadly.
Presuming your player ship and/or players survive the first round of combat they will be facing a multi Mcr repair bill. Not to mention the prison time.
Ship lasers and missiles are very much point defence weapons only. Small warships come with Pbeams or Fusion weapons (when they come back in turrets and Barbettes). These are the small ship killers not lasers and dinky little missiles.
There is a gap in weapons here anyway. There should be heavy missiles between the regular missiles and the "torpedos", where are the heavy lasers etc. This was talked to death many an age ago on other boards and a lot of these items were houseruled in but it is always better to have such things done officialy hint hint mongoose
If you want to add a + effect try per 3 successes for a more balanced lethal combat, +1 per two successes makes combat downright dangerous, +1 per 4 successes is a bit of a nudge for good roles and skills.
Oh and while talking about "Torpedos". Why, just why? Big, expensive, highly damaging and shot down every time. You use point defence fire like normal missiles so a triple laser turret can take out the fire of a 50ton torpedo bay. Clearly someone in procurement for the Imperial navy took some hefty bribes to even think about buying torpedos. :shock: