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.
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That looks great. How did get such good adhesion? My bed is super uneven so I switched to glass and had incredible results, but I have to babysit the first few layers because 50% of the prints are wrapped around the nozzle by the end.
Cleaning the print surface with warm water and soap, and then avoiding touching it with your hands, is a good start if you haven't done so alreayd. Calibrating first layer height, flow rate, temperatures, etc. is generally the way, but if you want a quick and easy solution I gotta say that Magigoo has worked really well for me. It's a bit expensive, but I've reapplied it a few times and never have to wash the bed so that one bottle will likely last a lifetime. I think you can get similar results with a high PVA content glue stick or hair spray. And there are of course other 3d print glues which I haven't tried, I'm assuming they work equally well.
I dunno, I use a mirror tile heated to 60⁰C. TPU and PLA seem to stick just fine. Have you tuned your first layer height?
I also give it a good scrub with isopropyl between prints.