I am not sure if you are using a GPU from MSI? If so, then the fan will indeed kick in at 60 degs. To be honest, if the heat is not causing it to throttle or hang, there is no need to worry. I leave it to the software to determine the speed of the fans.
Take note that when using external fan to blow into the casing, you are introducing a lot of dust into it. I did that once in the past and after sometime there is a lot of dust in there. Even without the fan, as long as the casing is open, it should be cool enough since the hot air don't recirculate in the casing.