I'm don't think balancing anything around an automated ship is wise. It isn't the typical use-case by a wide, wide margin.
Tac Lasers with HE just gives them a more defined role, that's all. I know it's supposed to be a generalist but I think the game has passed it by. HE makes a ship raise shields for good reason, which is all the Tac Laser was really doing anyway. At least it would make a ship pay more if they decided to tank it. There are more involved/complicated ways of buffing the Tac Laser but this is among the simplest. It's still not a lot of damage, it would be useless against shields, and it still has the aggravating slow beam speed.