I’m actually not afraid of printing things larger than a few square inches on the bed… Waited way too long for this. Tightening up the eccentric screws on the bed carriage so it doesn’t wobble also helps.
I’ve been using a 1/4" thick sheet of carbon fiber for years now. Once warmed up to temp prints stick hard on it. As soon as it’s cool a breeze can push a print of the bed. Plus it won’t shatter like glass does eventually, boy was that a surprise. You still have to wipe clean with some rubbing alcohol before printing.