Gamemako is right, the set up he's got gives you the most Parry and leaves you at 471 Accuracy, which is no problem to keep over 475 with the new food.

Here's a site you can use to play around with gear: FFXIV Gear Calculator by Ariyala Ta'nya - Lumoria «lum» on Hyperion

And if you must use the Warrior helmet, simply replace Hero's Wrist with Allagan Wrist, you'll lose a lot of Parry, but it'll put you right back at the accuracy cap.