21 hours ago, LostAndDamned said:
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Your case and fan setup seems like it should be providing good airflow, however, have you tested running with the case side panel removed? If temps drop noticeably then it's likely an airflow thing. If they don't change then it may just be how hot your card runs. 80 percent fan speed seems a little high to maintain 72 C, but I don't have an RTX2080 so I don't know how hot they typically run.
It also looks like you have the temp and power targets cranked to the max. What happens if you lower the power target back down to 100 percent? If you don't have a noticeable drop in game performance from that, but temps decrease, that might be worth while.