The only way that would work if it gives
1000 myth
500 soldiery
huh? This doesn't make any sense. First, you can still gear up without doing T5+. Ramuh, Leviathan, and Shiva are accessible without clearing Titan Ex. There is plenty for one to do combat wise without resorting to silly methods such as unsubbing until certain patches.
I occasionally DF Ex primals and T5 when I'm bored and most of the time end up with a clear. I don't understand how people can still be stuck on these fights. Maybe the issue is they're not as good as they think they are.
Its probably not you even though most people will say "common denominator" and what not.
I did 16hrs (with a 2 hr break) in the DF and finally got my first clear (5 others got their first clear then as well). The next day, cleared it 5 times with my FC. You really just gotta be persistent with it (not saying your not). The irony about twintania is that after twister, the fight is over essentially. You might die once understanding the 5 liquid hells or the hatch mechanic, but most groups quickly clear it once they have been through twisters.
Some common mistakes are people simply not focus targeting, and some people over-complicate the movement pattern for twisters (its crazy as a melee, but not impossible in the least).