Hi

the best results I have had are with a long lead in perpendicular and no lead out. This leaves a hard sharp pip behind, lead outs seem to leave a divot.

i have also learnt that what I need is called overburn where the arc goes to maybe 370degrees I.e. Over cuts itself, this burns off the pip.

Sheetcam can't do it yet but they are working on it apparently.

at least I know what it is now.