I have my Max speeds for X and Y axix ($110 and $111) set at 6000mm/m. My machine seems to be maxed out at about 2000mm/m. Is there another setting that will limit the speed?
How are you measuring that value?
If it’s by timing relatively small layouts, the machine cannot reach its maximum speed.
The RepRap calculator will give you some idea of the distances required at a given acceleration:
Fill in the axis acceleration from $120 / $121, the maximum speed from $110 / $111, and the length of the move from your layout. The graph shows the speed possible with that acceleration over that distance: the distance where the blue line peels off the yellow line shows the minimum distance required to reach that speed.
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No setting, but physics 
If your laser can’t move faster, it never will