The best way to use Tac Lasers is to mass them with range bonus & turret gyros and NO IPDAI. IPDAI makes Tac Lasers focus on missiles which is an absolute waste and exacerbates the slow turning issue. Make them focus on fighters instead. If you're worried about missiles, add a Burst PD or something.
Tac Lasers turn slow while firing and beam weapons take a little time to extend. This means they can flicker on and off when switching between targets and become overall quite inefficient if you force them to deal with missile swarms. Fighters are different, as these take many seconds to kill.
The best beam builds are the ones that work synergistically. That is, you use Tac Lasers, Gravitons, HILs or Tachyons all together, ideally on several ships. The more beams you have, the better they become as they have to overcome 'critical mass' of an enemy's soft flux dissipation.