Have you tried Rose levy's recipe? You need a digital thermometer for accuracy. The butter needs to give to your finger when pushed ,but not be greasy looking. I always beat on med low speed for aprox 2 to 4 minutes and slowly add the butter chunks( I stick my very clean finger into the mixture to see if it is cooled down). If it is too soupy you can beat it over an ice bath and whisk quickly, Taking it off the ice to beat with a whisk. Hope that all makes sense.