Using sheetcam with grinding disc tool

I am using the sheetcam for a cnc engraving glass 4 axis
With a grinding & polishing disc tool, i am facing a problem that the corner are overlapping ( the line is extended) i was trying to make a negative offset on the lead in/out window but it doesn’t work, is there is any solutions for this problem like setup a v curve tool or editing the post processor(mach3 V2 tangential) to make offset on the current & end point (X,Y)
Thank u in advance

does anyone setup a disc tool?

Give this post a try.
Glass cutter.scpost (12.4 KB)

thank u Less