As you can see, I bought a 20 watt laser from Atomstack a few days ago… IKIER K1 Pro 20 Watt - #23 by parsec and I’m not happy with the performance either, which is significantly different from the advertising.
If you want, we can continue to exchange our experiences. I have now managed to cut 10 mm plywood: Cutting Gears from 10 mm plywood - #8 by Tilman