So an update if anyone is curious about the results of plasma builds.

Changes
I used Fleet Advanced weapons instead of the Romulan ones, save myself over 100k dil, and basically just traded the Disruptor proc and an Acc proc for extra damage. I know its probably a downgrade in the grand scheme of things, but close enough and much cheaper. Besides, with the bow-mounted Experimental Beam Array, I can still get the disruptor proc anyways, just not quite as often.

Results
Oh my god this thing kicks butt. I haven't specifically parsed it, but on impressions and results, wow. Mirror Incursion, cooked the Stahdi inside its own shields. EWP3 alone (boosted by a load of debuffs from myself and others) was taking off 3k per tick despite shield indicators never even turning yellow. Federation Minefield, I have about a 50/50 shot of taking first, just roasting Fed ships despite their EPTS and ES buffs. CSE, Kang duty, flattening the BoPs and still having time to kill some probes besides, and when the Raptors spawned I wiped out one trio faster than the other 4 combined killed the other. KASE, probe duty on the right side, I accidentally spawned-and-aggroed a cube while on probe duty, but tanked the cube long enough to ensure no probes got away, then turned around and just disintegrated it before the next probe flight showed up without even needing full buff chains. I know for a plenty of people, this kind of stuff is pedestrian, but for me, this is a noticable improvement. I can solo an elite cube in my Patrol Escort for example, but it requires most of my buffs and most of my focus, and isn't something I want to tangle with when I have other priorities. The fact that I can pop a cube on accident now, I'm genuinely surprised.

Romulan Stuff Pros & Cons
Since this build started out as 'playing with the new Romulan toys,' I figured those in particular deserved mention.

The Hyper Plasma Torpedo (which I'm know lots of people have played with), oddly I'm finding the slow speed advantageous in certain situations. When I start an approach on a target and begin firing, by the time the torps actually reach the target the shields are long gone and so deliver more impact. Moreover, the doffs have procced several times, and so its pretty common to see 9-12 torps all impacting in one massive chain. Really rips up high-HP stuff like borg structures and cubes. On the other hand its pretty frustrating against smaller ships, who either move too fast to be hit, or die to cannon fire before the torps can do anything. Plus I tend to set myself on fire a lot using them at close range, but thats pilot clumsiness and not really something to blame on the weapon.

The Experimental Romulan Plasma Beam Array is pro and con at the same time. The Plasma Hyperflux is pretty cool, roughly tripling the damage of the next shot and inflicting (in my case) a guaranteed debuff of -32.3 for 10 seconds, plus starting a plasma fire for base 300 per tick. Basically it works like half a beam overload (with zero drain instead of drain spike!) and short-lived FOMM combo, and since the debuff is (I think) a boosted disruptor proc, it won't be cleared by TT or HE (I could be wrong though). I can see it being a nice ability on a BoP or Defiant decloak alpha strike, a big unclearable debuff with a little extra damage besides, and 'only' a two minute cooldown (times nicely with APA). The complete lack of energy drain makes the rest of my weapons hit a little harder, and having an extra side-firing weapon when in knife-fight range doesn't hurt, considering that a Tor'khat is still a cruiser even if a fast one. On the downside, my direct-assault damage would probably be better with another DHC, and really the Plasma Hyperflux feels like more a useful gadget than a serious power, similar to the Omega Gravitic Anchor or Jem'Hadar Antiproton Sweep. If I had it to do over again with what I know now, purchasing the Experimental Beam Array is kind of a coin toss; its cool to have and I'll keep using it, but I don't know if its overall any better or worse than a straight up DHC build so much as a little different. If you're not sure, don't worry you aren't missing much, but if you do choose to buy it you won't be kicking yourself either.

So yeah. I love this ship and this layout and its the most lethal thing on 7 toons right now. Strengths and weaknesses, but its fun to use.