I tried again tonight, still not getting the results I want. Maybe I'm using the wrong beads? Maybe I have to try the mini hama beads. They're just hard to get a hold of because they're basically only sold in the UK it seems. Here's what I did tonight:
1. Stood up beads on the tray, already in the oven.
2. Set the oven to 400 F.
3. Sat, watched them melt.
I can't remember how long it took, maybe 8 mins? But they started melting around 330 F. I let them keep going for a few more mins and they just kinda melted down into thick donuts, not rings. I'm asking around in some craft groups on Facebook that I'm in if anyone has had any experience, but I'm not sure I'll get replies. I might have to suck it up and deal with the donut-y beads
I also didn't use any papers - just straight on my baking tray. And also, I tried it once on tin foil and they melted right to it!