Did Hurricane's speed get doubled in the BB patch?

You are confusing character delay and arrow delay. Arrow delay shows the lag between each arrow firing. This does not change regardless of the level of booster. The speed at which the character moves through the strafe animation does change due to booster. Because the animation finishes quicker, you can move on to other attacks or even another strafe faster. But regardless of what happens, the delay between each arrow of strafe being fired is the same.