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Problem with THF is they have access to many pieces of gear that cover most if not all bases that any augment combinations that can be covered on the Mirke.

Therefore, IMO if you're going to make this specifically for RNG, I would personally go with Snapshot & Ranged Attack and use it as a TP body piece and save Osode (assuming you have one) for WS. If you don't have an osode, and/or intend to play corsair too, then put on R.acc & R.atk and make yourself a mini osode for ranged jobs.