The Cool Head lift option will help i think. Either that or print another object of the same height at the same time will reduce the melting a Robert suggested.
From my small experience 0.06mm or even 0.08 gives a pretty good result. I'd also reduce the temperature to around 200°c if you print at 30mm/s it will probably give better results also.
Your test print looks pretty small too i guess you will print it bigger, the melting should impact the result less if the area is bigger
More cooling is the ticket in this case I think. You're printing very very thin layers on a small area which means the head is spending a lot of time in basically the same spot and transferring heat into the part. This is why the top looks melted and it's making the overhangs worse.
First I'd drop the bed temp to 60C, that'll remove 10C of heat right off the bat. I'd also make sure the fans are going full blast. Perhaps lowering the print temperature a bit could help as well.
Then I'd try to enable cool head lift. I haven't personally tried it, but it sounds like a good idea in principle. If that doesn't do the trick I'd print either a second copy of the object or something else, at the same time. This means the head will move away from the delicate print for a little while and allow fresh cool air to cool it down.
And unless absolutely necessary I'd bump it up to 0.6mm layers, but that's up to you. You'll save quite a bit of time and I doubt you'd see much difference.
You could also consider skipping the infill completely. Increase the top layer thickness a bit and you shouldn't have any problem printing this as an empty shell.
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