PWM Fan will work just fine, on the headers that support PWM. Don't use SYS_Fan 2 though for it, unless it is fixed in your BIOS it will be super slow.

Temps are warm that you mention for that voltage, you sure you have a good mount and not too much paste? i7 is warm though, but that seems fairly high for that voltage.

Not sure on your easytune question, likely only in windows though.