Yes, definitely keep your gear up to date as much as possible (and not just your armour, your weapon and shield are equally important, because half your hate generation comes from how much damage you do with your weaponskill combos - i.e. Fast Blade-Savage-Blade-Rage of Halone, and your shield is basically your life. The stronger it is the less damage you'll take and the better you'll be able to protect your party).
And speaking of gear, even though generic Disciple of War armour might have appealing stat boosts like STR and Determination, ignore them - it's better to go for specific tank gear like heavy armour or plate armour which only GLA/PLDs and MRD/WARs can equip. This is because these armours have higher defense and VIT, which means all the difference between living and dying horribly. If you've been doing the class quests for GLA given to you by Mylla at the Collesseum you should be getting new weapons for free every five levels or so, so check your Armoury Chest to see if you have a better weapon available to equip.
