@reniat Sorry to hijack your topic, but I was wondering, have you made any progress with your temps?
I have similar hardware running on much, much less cooling capacity, and after switching to the EK Z270E monoblock my temps went through the roof.
MB: Asus Z270G
CPU: 7700K stock
GPU: Asus 1080 Ti Poseidon
Cooling: Swiftech H220-X
With the original Apogee XL waterblock, the CPU was reaching 77 under Prime. With the EK monoblock it will reach 97.
CPU idle temps are exactly the same so I believe the monoblock is mounted properly.
GPU temps are exactly the same, so I do not think there is an issue with the loop.
All tested in the same setup/environment of course, except the fans+pump spin faster on the EK due to the high temps.
Perhaps the problem is with the monoblock design, adding heat from the VRM?