This is the simplest test for underextrusion. Give it a shot. Make sure to do the test at 230C so that it is valid:
Put your spool of filament on the floor so it doesn't enter the feeder at an angle.
I'm not 100% sure that is underextrusion but it looks like it. It wasn't *any* worse at colder temps?
Looks like under-extrusion indeed.
You say you tried cleaning the nozzle with a wire what do you mean?
Did you try the atomic method:
You can also test your extrusion with the cylinder test:
There are multiple factors that can cause under-extrusion more info here:
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