I do agree that a two-tac-tac is quite annoying and difficult to deal with, and there isn't much to do to counter them. I play against bots most of the time who do exceptionally at healing. Here's some things I do when I see the two-tac-tac (two tactical cruiser tactic).
-First, I analyze where they are. Usually they are with a dreadnought or destroyer. If they are by themselves, their dreadnought or destroyer is dead and it is retreating.
-Then I use a variety of methods which have varying degrees of success
I mainly play as the Monarch and the Brutus, so I have many options to deal with this broken combo. If I'm playing the monarch and there is a tactical cruiser within range, I don't even worry about other enemies. I focus my missiles and nuclear missile on the tac cruiser to kill it/them as fast as possible. I use the tractor beam whenever possible to bring it within range of my actual damage which is flechette missiles and flak.
If I am my Brutus, I use my ram and flak to unload tons of damage at once.
If I am a corvette, I entirely focus on the tac cruisers and artys of the enemy team.
Basically all you can do is attempt to kill them fast enough so their buddy can't heal them or to pull them out of combat. To do this, use tractor beams, nukes, rams, assault blink warps, and so on- For the Oberon tac cruisers, watch for their beam amplifier. If they have it active, the take more damage. USE THIS WHENEVER POSSIBLE. A single arty can deal almost 20000 damage with a single well placed shot with energy to weapons while this is active.
Another tactic, however difficult, is to distract the tac cruisers. When there are two, they prioritize certain allies, which includes themselves. If either one takes damage, the other will immediately heal it. So use this to distract their healing so they can't heal the main target of your team- Ie the enemy dreadnought. While they focus on healing each other from enemy fire, their allies die. So send your team to focus as normal, but be prepared to constantly shoot them. Once the enemy push is slain, your allies will turn on them and thus- Kill them.
If you were seeking for a guide to deal with this, here you go! If you were seeking for a place to complain, oh well. I hope this helped!
"Oh, poor poor corvette. You thought you could escape the grasp of my tractor beam."
Hit me up on PS4 if you wanna play some T4 and T5 matches (Gamertag: 'HanBahnDay')