Like John, I'm in a hurry!
I have come up with a bit of a fix, doesn't eliminate the slag but it helps---
What I do I use the 'line reduction' to keep the main cuts from going all the way to the edges, then running a series of lower power/higher freq outlines to finish the edges--
I just drew this up as an example, but my numbers are pretty close. Also, I used black and blue cross hatches just for visual, in normal use I'd just use black for both hatches...
First 2 hatches are .05mm line spacing, 45 and 135 degrees...
for the first hatch I've added a .1mm line reduction--
f1.jpg
2nd hatch I entered a .07mm line reduction--
f2.jpg
The 3 hatch is a 5-line 'island' routine. To do this, I entered a "0" line space, this prevents a full-fill routine.
Then at the bottom, I've entered 5 in the NumLoops, and entered a tight loop distance of .01..
f3.jpg
This is the result....
f4.jpg
So what happens is, loop one runs but avoids the edge by .1mm,
loop 2 extends the cut by .03mm-- So the middle minus .1mm is hogged out, 2nd pass creeps out a snick farther...
Then the 3rd hatch runs its 5 lines from the actual edge and meets the first 2 hatches.
The trick is, to find the right speed, power and frequency of the island hatches, how many loops to run, and the spacing.
I've only done this a few times on some AR lowers, and haven't had time to experiment much, but it does cut the burr down a ton, and seems like a good compromise between fast-as-you-can hogging and slow-n-easy hogging...