First lose the torpedo and go full DHC in the front. When you do that you can have four tac consoles that affect all your weapons. You can also respec to put 0 points in projectile and all in energy weapons, making more dps. Also ditch the cutting beams turret results in more dps. Secondly fleet weapons are not that great…
The drain from the 4th cannon might in fact hurt your power drain, but the advantage of running the 4th cannon is you can put max skills in energy damage and none in projectile. Also, your tac consoles affect all weapons, not just some.
Zen cards can be purchased from CVS, Walgreens or Walmart places like that if you live in the states. If you can't find PWE cards u can also get Ultimate Game Cards at these locations or http://www.ultimategamecard.com/