Mustiyo you´re a genius! Thanks a lot for this thread!! But first sorry for my (probably) broken english, i´m from Germany.
i searched a lot for a nice working cooling mod, tried a few myself (like the simple "holes over fan") but this kills it in a big way. Personally this is the cooles PS4 (Pro) Mod ever! I did it myself now, works like a charm, the jet now is dead silent, my fan only spins in idle mode, everything is cool temps are great.
gloued it with 2 compound epoxid, rock solid.
wanted to share it.