Thermalpaste Artic MX-6 or Thermal Grizzly Kryonaut extreme

I need a new thermal paste for my GPU and it seems either i have a bad tube of mx4 or its just to "weak" for a RTX 2070 Super (gigabyte oc 3x)
It either dries out or just starts to overheat after 2 months (solution always was reapplying) but i don't want to change it every 2 months (just want to have something to put in and not really think about it)

I am annoyed after having this problem since 8 months ago where the original thermal paste dried out (it was dry and when i was just browsing on the web my fan on my gpu where on 100%)
Its not the case i have a Corsair 4000D Airflow
i will also change the thermal pads (i know the thickness of each of them and wich one to buy )

Just need a definitive answer of wich one of them is good for longer use 18 months and up for a gpu

picture to where it will be applied:
https://imgur.com/a/w1U5MJS