Fender gaps are based on the manufacturer's design. Mas malaki lang talaga ang harap to accomodate your front turning tires. You wouldn't want to scrub the fender on each full turn.

Sa likod di naman po kasi pimipihit ito tulad ng front tires kaya halos sakto lang ang gap ng tire to fender. :D

One thing you could do is lower the front end more than the rear, but be wary of your tires and fender scrubbing.