High watercooling intel CPU temps Help :(

[Tenecchi]

Hello everyone, i'm seeking help after some month of throubleshooting ! i did some search and ask the help from the support from CORSAIR and did not find any solution 

Here my probleme :

My CPU is iddling at 50/55°C (5Ghz~) 
and 44°C (3.5Ghz~)
the CPu reach often 70°C without gamling for small period of time 

My setup :

CASE CORSAIR 5000T
Z790 ACE MSI  (bios last update )
Intel 19-13900KF
CPU BLOCK

XC7 RGB PRO 

2x XR5 RAD 360

XD7 Pump/Reservoir Combo

RAD : front intake / top exhaust 

At first i had only CPU watercooled and now i have the GPU in the loop without any change in the CPU temps
The GPU is now at 32/35 °C iddle


 

When iddle and i set every FAN and PUMP a 100% the GPU temps drop but not the CPU one
i did check the contact : and it seem fine for me  
I did replace de CPU  block through RMA once without any change



How can i improve the Temps and is the contact on CPU enough ?or the waterblock suck ?
My probleme is from the CPU ? the MB ? My loop ?

I'll gladly send you curve temps and test if i can !

HWiNFO / XTU / ICUE or other