1. If by skill piece you mean BLU skill, then yes. Sword skill only affects ACC.
2. PCC is better for the ACC. You don't benefit from the ATT gained by Fort Torque and the torque only has ~6 ACC.
3. Suppa + STR Ear maybe. If you're using ATT items > Sushi, then you'll want that extra ~4ACC from the ear equip.
Edit: Since you're using ATT items > Sushi, the ACC from gear becomes increasingly important. I understand that this is a hypothetical situation, but you'll almost never be in a situation where using ATT items > Sushi-like items (Maybe Pizza?) since ATT doesn't affect spells and you gain more STR from gear than items.
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