The problem is that its a saison. slowly warm it up through the range now that the yeast is done with conversion. This is a style that likes to keep the yeast around a while. I'm thinking at 3 weeks in primary it will have finished, cleaned up well, the krausen will be sitting at the bottom, and will have imparted the flavor you will want out of a good saison farmhouse ale. As Alton Brown says, your patience will be rewarded.