We dont target kings as such, got a couple smaller on light gear thu..
 So will leave the more informed answers to the experienced guys.
 We run 20lb braid on everything for general fishing...
 20 lb fluro thu, the stuff snaps so easy on a reasonable table snap if hits into the rocks.... so now run 30lb min.

Lost a couple nice kings while at anchor around reef/ foul due to not being able to pull anchor or drop warp, fire engine and pull away from the reef.

So I would suggest if targeting kings on light gear, do it on the drift maybe.

If out in the open sea no reef to bust you off , totally different kettle  of
fish.
 Did use 80lb fluro and hit something big, reefed use after a long run, but with 30lb braid , and no knots failing when you would like them to lost a heap of braid.

Nothing wrong with youre current setup especially if fishing from a boat.

Few months ago I accidently nabbed a 21kg king from the rocks whilst spinning up kahawai for livebait, was using a daiwa morethan branzino with 20lb Tasline and a short 30lb mono leader. Was in about 5m of water.

If it can be done off the bricks it can easily be done from a boat.