As i said before its probablly the lack of airflow being in a cabinet with the door shut. The cooler you have is not bad but you sre limited to coolers up to 140mm tall.
Opem the door runs some tests.
I appreciate that, however I do have fans to help mitigate that. The cabinet air doesn't get hot - the fans seem to be doing their job,
Just ran a test with top off and door open, it peeked at 78 but the scores are back on track 13171-9768-12516. Then I ran it with PC out of the cabinet (well, half out) and temps and score were lower! 13159-9679-12485! lol