Just rolled a 382%ed eth Death berserker axe. Just wanted to check on IAS calculator to see how much IAS I need and at level 28 Fanaticism, I only need an additional 56% ias from my gear? That seems awfully low and super easy to accomplish. Is this accurate?

Yep

Follow up question to this. I'm running the current gear:

G-Face
Highlord's
HoZ Um'd
eDeath BA
Treach DS
Dungo's
Laying of Hands
Gore Riders
Ravenfrost
Dual Leech Ring

What should I socket the G Face with and should I change the gloves?

You’ll need 60 ias for death ba so ias in guili and hoz to hit bp with highlords and laying of hands. Those are the best gloves so keep them.