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compression test can help you diagnose that, or there is a reactive that changes color with carbon. Take some of your coolant and put some on that.
also put that thermo back in, let it do its job, and get a proper gauge. OEM one is not linear at all.
If you removed the undertray and/or slammed the car, hot air has nowhere to go, so you could install a 20" thick radiator with a massively flowing fan, it would not matter.
Otherwise the usual reasons these engine overheat is when timing is retarded and/or fuel delivery is bad.
You may have all these problems, so instead of trying to fix the consequences, address the problems.
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