100% agreeing with Lionx about HP vs MP. He's right that you will rarely spend time at full HP and that makes it far less useful. HNMs are pretty much the only situation that a full set of HP gear might help on. Aside from that a Taru tank might want some HP gear when tanking things like Spiders that can 1 shot them with Sickle Slash, but that's very situational.

MP is worth so much more, especially for a PLD in XP. Lion said it but I'll say it again. Having 10 MP is the equivalent to having 30 HP and also helps hold hate. Having 10 HP just isn't gonna do much at all.

Keeping that in mind, something like a Cassie Earring (conserts 50 MP to HP) will hurt you even more. You gain 50 max HP but lose essentially 200 HP worth of cures which can keep you up longer and hold more hate.