There's been some tests with accuracy, just not WS's specifically. You'll have alot more success with +acc gear than you will with Dex. Dex literally is in the ~5% range capped out in terms of accuracy.

You might want to add acc food in the mix with your tests also. It's more or less pointless to do this though since all the battle changes are coming soon that will more than likely alter the entire mechanic.