Hey Mate, I use that in my carputer setup on my 2.93 E7500 chip - works fine, no worries.
Don't worry about the flexing of your PCB mounting the stock intel cooler - there's a lot of misconception floating around on that - PCB's are very strong, and can handle that without an issue.
I've been overclocking and competing internationally for many years, and have mounted/dismounted literally 100's of various heatsinks/phase-change systems on motherboards, and yet have to kill one.
Test the 2 heatsinks you have, and retain the one that gives you the lowest average loaded temps.
Have a good one.