Your problem is that you're short on attack patterns. You'll want an APB or APD (APB for PvE, APD for PvP), and quite possibly a second APO. Once you start putting those in in large numbers you'll quickly be longing for more slots. Something like this might work for PvE (assuming you're using a Tac Escort Retro):
On my Tactical Escort Retrofit, I do not even bother slotting the third tactical ensign. And I run all cannons.
While it's a wasted ability, I believe the new Romulan tactical boff helps even that loss out with an extra boost to critical hit and severity (when they get the stacking working and change the nature of Covert Operative to give less critical hit, but adds critical severity).
I'm guessing you're referring to a Tactical Escort Retrofit, but you have two Commander level abilities listed, which isn't possible.
My layout is like this:
TT1, CSV1, CRF2, CRF3
TT1, APD1, APO1
BO1 (again, not used)
I use CRF much more often than APO, which is why I decided to go with CRF3. If you had DOFFs that reduced the cooldown, then I guess having APO3 might be worth it. But, I'd rather have the higher level ability reserved for the skill I use the most.
I find that I like APD more than APB, for the debuff it casts to everyone who attacks that target. If you pick up one of the new DOFFs, you can increase the threat generation on yourself or your team mates with APD. You could cast it on your team mates that you don't like or the ones that are in cruisers, so you can get some free hits in. The trolling you can do with this ability and DOFF is pretty nasty.