Thanks for sharing your solution.
It’s a shame, pathetic actually, that people have been compaining about the EX2 heat since at least July of 2014. We have been asking WD to give us the ability to set the fan-start temperture lower (e.g., so the fan starts to operate at a lower temperature). Qnap and other NAS vendors allow you to set the fan start temperature in their firmware but not WD.
Here is a link to the discussion that has raged on for almost a year.