I don't really feel like Royal Authority needs any adjusting (though damn are its visuals gaudy...)

Instead:
Raise SB and RoH enmity mods.
Increase RoH duration to 24s. (Given that DRK affects often raid-wide, unparryable damage, and SP affects both magic and physical, a small duration buff would by no means be overpowered, and would allow it be kept up at every third combo (+ 1 GCD/cast).)
Give Shield Swipe a 12s CD that resets on block, to use as choiceful filler and slight average TP-cost reduction.

aaannndd ...turn Spell Speed and Skill Speed into a single stat - Speed.
(And while we're at it, move Speed's effect on DoT damage from... 72.5 per 1% iirc to something a bit more in line with Determination?)