On Gladiator/Paladin you're going to want to initiate with a Flash (good instant hate for inept tanks) then move onto your Fast Blade > Savage Blade > Rage of Halone combo and do that multiple times. Flash every now and again if you have multiple mobs depending how much your healer is healing and also switch targets every few hits to keep hate on everything efficiently. Marking mobs 1-5 in order can also help direct your DPS to focus on enemies you're focusing on so you are less likely to drop hate.

Only use Riot Blade if you're low MP and use Shield Swipe if you're high on hate for higher damage but lower enmity. Shield Bash you should only use as in interrupt attack.