Spread -50%. Yes, you can focus more on a target, but your splash from spread rockets will reach the center most of the time anyway. Spread is GOOD for rockets and mortars, you want this as high as you can get it. This will allow you to destroy more enemies while you are still out of their range, and adds to the effect of splash in this manner. The -50% spread is a nerf, not a buff...
Me: Here is how I clear the fleets out of the 500 with Silverfish
Worz: Um... You're hiding behind a rock.
Me: I'd hide behind a preschool if I thought it would help