Saw this article
https://arstechnica.com/gadgets/2018/02/samsung-crams-30tb-of-ssd-into-a-single-2-5-inch-drive/
Samsung is going to be releaseing a 30tb 2.5" ssd...pretty sick.
something I noticed on one of the pictures, one of the tubes is pinched really bad and could be part of the flow issue you are having with temps. You should put a 90 degree or a 45 degree connector there or rerun that tube.