@Antonio Why are you at all trying to hit 75% gunboats? Because they didn't feel 75% core on basic turrets?
An example about bomber is quite logical, it should be as it was. For example, 75% gunboat would be unusable if it used something like Supernova or Nova Torpedo too.
P.S Back in 2010-2011, we used to fly unlawful Gunboats with Pirate IDs and faction turrets (most commonly Zoner Turrets). So we were living in a big lie and it was all a big unbalance? If I compared 2010 and 2016 I wouldn't say the game is more balanced now than it used to be.