IMO beamoverload3 misses too much. and with all those beams you got on your ship you might not want the sudden and revolving power drops by running 2 overloads. even if you run weapons batts and red matter capacitor and such.
i think you get your best spike as a tac in excel when you sandbag to 40% hull or so then harden it with say...Brace for impact and Polarize hull...and aux2damp. then get the max out of stacking Go down fighting (by not healing hull, just a 15 second hardening) APA, APO, FOMM, TF. make no bones about it you are a tac cruiser and go down fast without support. i played defensive 75% of the time using a 6 array 5-7 click broadside suppression at a slightly lower weapons power between spikes.
mavs advice on high cap resilient shielding works great with this idea, as it lends to limit bleedthru.
and id run at least a neutronium...although spreadmania has me slipping in the monotanium lots in my cruisers lately. gl with your build man.
Not the biggest fan of tact cruisers myself, but if you want to run one it's probably a good idea to run one copy of RSP.
Also, pretty much the only reason I can see to run an excelsior nowadays is to get an omega for stun resistance so that you can use ES without fear of it getting bumped off, without having to lose an Aux2sif.
4 DBBs, with 4 turrets aft go bo3, and bo2 with Tac Team to finish it off.
Run 2 Aux to dampeners. Though this setup -only- works for a tac captain in my opinion since you need the boost from APA, and GDF to make the dps worth it. I also recommend EPTS3, and Warp Plas 3 with ASIF3 as an alternate boff choice. 2 EPTW1s, and in the ensign run EPTS1. This also will allow you to run a fairly exotic power setup which will enable you to have almost max weapon and shield power at all times. (I believe you will want to set both of your sliders to 75 for shields and weapon power, once you run a +7 shield and +7 weapon power consoles.)
TSS2 and either a TSS1, or Hazard emitters, with an aux battery to spike it when you need it. Hazard gives you a strong hull heal when spiked with a good damage resistance.
It's a pretty nasty ship, as aux to dampners is now perfectly chainable again, making you immune to stuns, and repel effects constantly unless you are SNBed, and aux to inertial dampners also greatly increases your turn rate. I also recommend one RCS console with the setup to have an even work able turn rate.
your last console slot should be the +35 percent to shields of course.
Due to the superior inertia of the excelsior (to every cruiser out there) warp plasma is much easier to use, and you will find it quite valuable in keeping targets in your Prime DPS arc, as well as keeping escorts off your back, as you can make a cloud and nestle your ship inside of it, if necessary. Once you get good at deploying the Warp Plasma you can routinely snare entire enemy teams in place, inflicting the dot on them, as well as robbing them of a defense score, in addition to keeping them in your forward arc once you perfect a flat spin to get your ship 180 degrees around.
With proper use of Evasive Maneuvers, and all of this people will have a rather difficult time in effectively dealing with your ship.
I also recommend you do the STFs, to get the borg gear, as Aegis is quite simply Terrible. And the borg proc gives you a very strong hull heal to round out your setup in addition to gaining a very strong shield heal.
You may also want to consider Resilient Cap 3 shields, as an alternate for the Borg shield, as your hull healing is very limited with this setup. (but the damage capability is very strong)