I may be wrong but I remember reading something about enmity being useful if worn full time as it slows down hate decay. Maybe I'm wrong since this was before the enmity tests which I admit to not fully understanding.
You're wrong here. Kanican proved that Volatile Enmity is ALWAYS -60 per second. There's no way around it. If you have VE, it'll decay at that rate. And, if I remember correctly, +enmity does nothing to help you hold on to CE when you take damage - it's just your total HP and the amount of damage you take that affects it. So, idling in Enmity gear is giving a small boost to damage dealt CE/VE at the expense of being able to deal more damage and thus net higher CE/VE from it.
I forgot about the whole sh*ts situational thing and failed to give situations.
You've got the right idea, but there's no situation to full time enmity gear.
This actually brings up another question I had; should I /rdm for limbus farming runs? I figured the DoT from Joy+enspell would outdo my slow ol' company/joy or /nin with joy/koenig since I'm just regearing my pld for tanking purposes only. Or should I stick to going as BLU or rdm to farming limbus runs?
I'd rather go BLU to farming runs now that it's 75. My PLD may be a little more tricked out, but we've got plenty of people with just PLD to fill in that role. I'm assuming that you're in a similar boat.
My earring slot needs some heavy duty upgrading. The best I have is the +15mp/hp and +15 mp earrings.
Ditch them. At the least, get Merman's Earrings. They'll hold you over AND help with both DD and MDef setups. Fairly cheap, too, really.
I'm aiming for Loquacious but so far I've upgraded to rdm af body+1 and half way to blu af body+1 so these are keeping that goal of obtaining one far away.
Loq. should be the last thing you pick up for PLD. Brutal will serve you better, regardless of what you're doing, since it should be on more than Loq.