Good news folks !!!
I’ve just done a simple test cut, a curved line., through some goofgrade 1/8" acrylic from Home Depot.
I first ‘cut’ the line on a piece of mount board, to give me a location, then place three magnets in appropriate positions to avoid the beam.
I then placed the acrylic on top of the magnets, so I now have the plastic, with an air gap of about 1/8" below it, over the test mark.
Fired up, making the necessary adjustments to the thickness, but using the 125/full settings that I previously used for this sample of material.
No ‘hazing’ around the completely clean cut, with only a small amount at the beginning of the line. Not sure why, but the result for me is a perfect solution.
What I’m doing is to cut acrylic glazing for my small fan leaf display frames , and now a very happy bunny !
John 
