I have a K40 and I make and sell boxes and other items for events, businesses,individuals, you name it. I would like to make wooden stickers with adhesive backed veneer, I've run into some problems. Even on the lowest power setting of 8% I'm burning through in places. My machine wont burn on anything lower that 8%, I guess it's not enough to activate the laser tube. Even the places that don't burn through burn so clean that it's hard to see the design. So any advise?