Here I am after a while with some update.
I wasn't completely satisfied with my runs and with the coolant, that leaved some stains, therefore I decided to completely re-do the loop.
While i was at it I removed all the HDDs, in order to have clearance for a bigger reservoir (250) and a bigger front rad (replaced the EK SE360 with a EK CE420). I tried to put a PE360 on top but there was a clearance problem, therefore I had to downsize to a SE360. With the new 420 rad I switched to 3 bequiet silent wing and replaced all to HD fans to LL ones.
I also replaced the cpu waterblock with a newer Velocity RGB nickel, and the gpu block cover and terminal. I also wanted to switch to the rgb plexy top for the pump but it wasn't on stock.
To complete everything a bitspower flowmeter, crycofuel clear and new cablemod cables.
I also delidded the cpu and added a crucial p1 nvme the ekwb heatsink.
Below some picture of the work
cpu delidding before and after
Old loop components ready to be cleaned
New waterblocks and pump placement (still waiting for the new cablemod cables)
Final result