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True Strike is a very good optimization ability, it moves your combo to the next step and has 150 potency (along with +5% crit rate from the back but that is irrelevant).
Generally you will want to alternate Twin Snakes and True Strike in your second step, changing every time, because you have enough Twin Snakes time to do that. Also specially useful to maintain your DPS higher in case standing at the enemy's side proves to be a difficulty due to area hazards (suffered that against Aiatar and in the Aurum Vale)