That's an expensive CPU.
Yes, in that case you want to be even more careful.
That CPU is a beast on temps. But at least they are designed to save them selves if needed.
I would recommend going with what you have there.
Putting the heatsink/water block on and mounting correctly.
The first time you fire it up run it for ten minutes and then shut down, and take off the heat sink and confirm coverage. New paste is supple enough to remove the heatsink and check, with out having to clean and start over.