Need help with laser cutting acrylic

[mondrota]

OK, I've made a spikey bed and after trying it out it seems to be about the same or maybe even worse. I'm currently placing the sheets on an old scrap sheet of acrylic that's had parts cut out of it. I've attached a couple of photos of the trial cut. What's weird is that one edge is not too bad but then the other edge adjacent to it is a lot worse.

Any more ideas / suggestions?
Thanks