Fill, seems to be over cutting lines in between shapes

Leather has given me trouble getting fine lines cut. One thing that helps tie it together is to add a LINE cut around the shape. Also, check your MINIMUM power setting.
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Turn down the power and speed. If your laser is cranking out a high level of power, it takes a millisecond for the laser power to dissapate, Moving the head of the laser slower at a lower power will give it more time to bleed off the excess energized power in the laser. Think of a garden hose that is going at full blast. When you turn off the faucet, there is still water in the hose that is moving to the end of the hose.

I have found that OFFSET fill helps with keeping the edges clean, too.
HTH