I am an engineer and fly a defiant retrofit. I currently have 1 dual beam bank, 2 dual heavy cannons and one quantum launcher front and 3 turrets in back. I have beam overload 3 and rapid fire 1. Would it better to go 3 dual heavys or stick with what I got for straight melting DPS?
I switched my build around after doing forum research when I started doing STFs. I don't have any hard numbers to point to, but Borg die quicker and I stay alive longer with 3 Dual Heavy Cannons, quantum torpedo up front, 3 turrets in back, and 2 versions of Cannon Scatter Volley.
Maybe I can open with rapid fire and my 2 DHC then use thy3 and bo3 to finish them off
That is a pretty common tactic in PvP and a good one (found out by being on the recieving end), but in PvE, especially STFs, the Borg ships have substantially higher hull points.
The hard hit you will give with the BO3 will just deeply scratch a Sphere, and them your left with the lower power to weapons for lower follow up Damage.
My personal conclusion:
It's a good build against Probes as it quickly will pop that last Nanite probe.
It's 'ok' against Sphere's. see above.
It's not so good against Cubes, and worse against Tactical Cubes. Go DHC against the Tac cubes with CRFs for better sustained high DPS.