Even a ISIS Firepower, that will be impossible, let's make this changes..
For the Pulse transport turret...
Shield Damage: 5000 and refire up to 4.33
For the Charon transport turret...
Shield Damage 1000 Hull Damage 15000 and refire up to 6.00 (due Crusiers armor upgrades...)
For the Iron Hammer transport turret... (and all house turrets)
Shield Damage 3000 Hull Damage 6000 and refire up to 7.00 speed of 1250m/s
For the Dulzian transport turret...
Shield Damage 500 Hull Damage 1000 and refire up to 8.33 and range of 1300m
and of course, GB/Crusier Shield, Mine Capabilities, and more turrets (super transports and that with 6 turrets...) more firepower, cruise speed (in m/s and recharge) Energy core of a gunboat class and special prices of Armor Upgrade for Transports.
maybe, with this... i think a transport with 10 turrets...
4 pulses, 4 charon and 2 dulzians will be ok and can defeat a crusier.. (crusier have all heavy weapons, will be armed with mortars and pulses, missiles and cerb)
you can survive to one crusier, but, 2 crusiers against you.. even 12 or 14 turrets is impossible (let's add a foward crusier cannon in transports) xDD and refire of 0.66
i don't know, crusiers pirating, and... what happen if a battleship try pirate us?
...this is stupid...