These parameters seem to work well for both laser and milling operations.
See here for explanation of GRBL configuration
$0=10
$1=25
$2=0
$3=0
$4=0
$5=1
$6=0
$10=19
$11=0.010
$12=0.002
$13=0
$20=0
$21=0
$22=1
$23=3
$24=50.000
$25=500.000
$26=250
$27=1.000
$30=1000
$31=0
$32=0
$100=400.000
$101=400.000
$102=400.000
$110=1000.000
$111=1000.000
$112=1000.000
$120=2000.000
$121=2000.000
$122=2000.000
$130=280.000
$131=170.000
$132=40.000