I dunno if it helps but when I'm tanking, I generally use my openner just Rage of halone combo until Fight or flight goes down, then I simply don't need to worry about aggro almost my entire fight and I use the Goring Blade and Double royal Althority combo, I can even change my oath after that and I can still hold my aggro without the necessity of an Rage of Halone... but it depends on your gear compared to the dps.
I could say more about the class but Sapphidia covered almost everything I use as a PLD (Expect my openner)