Thermal paste just transfers the heat from CPU to Heatsink, beacuse the surface of the CPU's IHS (Integrated Heat Spreader, the metallica plate on the CPU) is not polished or super flat, and might have microsocpic pores / surface imperfections which would prevent full contact with heatsink and hence full transfer of heat, so the paste fills up those imperfections. You don't need much paste, just enough to fill those imperfections and ensure full contact.
Even more than quality of paste, quantity or application; what mostly comes down to is the compression of heatsink (tightening) to form proper contact. If there isn't enough compression of the heatsink (not tight enough) then there isn't enough contact and hence not enough heat transfer.
What you are seeing in those 90+ temps could be worse as the CPU could be throttling it self down so it does not go beyond the design limits. Thermal Grizzly Kryonaut that you already have is an excellent thermal paste, you wouldn't see much improvenemnt with Noctua NT-H1. Maybe re-apply it and see first.
I would open it up, see the pattern on CPU and Heatsink to see if it was correct application and contact, then clean it all up with Alcohol Swabs (avaialble in Pharamacies). Use the spatula that comes with TG Kryo to spread it to make a thin film, then put the heatsink flat level on to it, being carfeul not to put uneven pressure on one side as it will push the paste to other side, then tighten it evenly in cross fashion gradually till its fully tightened.
