> my bed wobbles and squeaks a fair bit...

Well, that isn’t necessarily a bad sign I guess.

I’ve found many beds ship with the minimum viable hardware to hold them together. You might see if you can find better screws/bolts/etc and replace the cheap ones that come with your frame.

Another semi-permanent option is to run lines of wood glue before connecting pieces together.

Well, you are right, my only IKEA bed was bad and I spent over USD 1500 (in CZK) for a solid hand made bed, which will likely outlast me.