Donāt know the power of your machine but it seems to be cutting into the surface enough on 20%. anything under 8-10% (depending on machine) will not be enough to make the laser fire, but if you are just doing black and white image then thatās no issue.
I would remove the ramp completely, on such a small design having 0.5mm ramp is to much imo.
If I was doing it without testing I would use this :
speed 300
Max Power 20
Min power 0
interval 0.15 mm
ramp off
If you want to have the outer ring with a ramp, put that on a different layer and add the ramp effect back on.