If you can't move it even a little bit like SAABoholic suggested, will moving to the same point work?
ArcL\On, p10, …
ArcL\Off, p10, …Adjust the seam & weld data to get the weld you need.
If needed, you could also try replacing speed (velocity) in the ArcL\Off with time (\T).
I have never tried to move it to the same point.
It's a good idea. I'll try it.
I had some problems with ArcC commands, when two points (cirpoint and endpoint) were too close to each other, I had got an error message.