Remove smcFancontrol and install this instead....make sure to set smcFancontrol to the (Default) before uninstalling it.....
.....I had the same experience as you and this allowed me to have the fan ramp up earlier as the temp climbed....
Uninstall smcFanControl, it only allows you to manually control the fan speed. Instead get Fan Control 1.2 or for a small price HDD Fan Control for your Mac Mini. Fan Control 1.2 was originally designed for a twin fan portable Mac, but also works on Mac Mini's and Mac Pro's.
I have a 2010 Mac Mini running Mountain Lion and Fan Control 1.2 works great for controlling it's temperature from CPU and graphic's loads.
Under normal and low loads the fan runs a the default speed,
then as the temperature increases from load the fan speed increases to control the temp.iMac, Mac Mini, iPad, iPods, Mac OS X (10.6.8), (10.8.2), Safari, iTunes, iPhoto
If you find that the fan is running up to high, move the Upper Threshold slider up until things stabilize at around 170 degrees under an extended load.
Also note: That it is best to keep the fan running at the lowest speed possible, because internal dust accumulation is also going to increase and the Mac Mini will need to be cleaned out more frequently.