A Deep Dungeon Possible Issue

[StouterTaru]

Now, I'm at 28 Arm, and 29 Armor.

You would be able to get the bonus when your job PoTD job level hits 57 for the arm, 59 for the armor. That can be before the final level. I'd suggest a pre-made, and farm exp on floors 9, 19, 29, and 39 until there's under 10 minutes left in the run so you can be at a higher level sooner.