Grinding for a long time is just that. To conche you need to apply heat. A heat gun at 65-70 degrees for about 8 hours removes any volatiles and so improves flavor. I think there is video of this on this site. You may want to think about the end result ie. what is your desired outcome ? Then choose the right variations of temperature and time as well the actions you would need to get the right flavor and texture [mouthfeel] you desire.
Using a fridge to cool is a not advised as the temperature is too low, try a wine cooler. Maybe try to cool for a longer period.
Clement