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Will look into it. I thought they where already but I guess I must have forgotten or something. Sorry.

The 90 TK set is still fine for you as it levels up with you. You might be missing some other defensive aspects which is causing you issues such as resistances and equipment. Make sure you have equipped all your certificates and try asking around from some trophy enchants for your trophies as they will give some decent health. It's also worth making sure you level up all your classes to level 80 using the Basic Class Level Stone from Temple Ranger Yukari in Aven. This will give you more Health. Other things that you can do is do some of the legendary achievements, specifically the armors and world bosses as again more health and resistances. Without seeing your full setup however this is probebly some of the best advice I can give. If you're dead set on improving your gear though, you might want to try get some in game help to get the level 95 Awaken Armor. The quests have been simplified a lot now so you should be able to do most of it solo but you might need a little help getting the pre-awaken pieces and one or two of the bosses might need help.

After testing it, its M-ATK although reducing INT also reduces M-ATK.