You can't use three copies of TT1, the shared cool down prevents more than two from working. Your only options for the third ensign tact slot is a beam or torpedo skill, but you have neither beams nor torpedoes (that benefit from High Yield or Torp Spread).
Your best option is to replace the hargh'peng with a quantum so you can run a torpedo skill in place of the third TT1. You could use a dual beam and BO1, but I don't think BO1 is worth the drop in DPS.
Quoted for truth. I'd get rid of AP: Delta for T:spread 2 then pick up T:High Yeild 1 in that ensign slot. That'll give you some good AOE and single target potential without specializing in either one.
IF you're going to PVP at all get rid of AP:Beta for AP: omega. Having two omega's will greatly increase your survive-ability and time on target with your weapons.
For Duty officers try and get some BFI(Brace for impact) doffs they turn brace for impact into a very good shield heal.