Im setting up a computer for my parents, nothing fancy, but i noticed that the stock Intel fan that came with the CPU snaps in, while installing i noticed the board is being pulled up on all for corners.....
Well.... once you get it screwed into the case, i doubt there'll be any bending.
a bit of warping is quite common with heatsinks, just usually not noticable due to the circumstances. The easiest ones to notice are on slightly overtightened aftermarket VGA heatsinks. those boards tend to bend rather easily sometimes.
Bios will have fan speed setting but will go off of a preset range of temperatures.
I use SpeedFan to adjust fan speeds and monitor voltages/fan speeds/CPU and MB temperatures. SpeedFan can be set to exact setting to raise or lower fan speeds.