Personally, I don't like setting land speed records with flaps 30 at 66,360 tons with flaps 30. Hense flaps 40 is my preferred flap setting. I've never experienced the so-called drunken pig sensation, even with strong cross winds.
Easier on the brakes and better for the quick turns. 8 knots difference in Vref puts about 800 feet of runway in the bank.