[GuyBFF]

If you went with solid nuts, the same problem could happen with just a little over-tightening, or the motherboard flexing. When I put my hoses on you could see a small, but noticable movement of the waterblock springs, I'm not sure what's the best way to mount it... just as long as it's flat. I did however have much, much, much higher temps. Likely your waterblock is flat as mine just skyrocketed with only an edge contacting!!!