How many private sessions are you guys doing a week?

I am trying to figure out what I want my "pilates split" to look like. While I adore group sessions, I think it is important to do privates once in a while to ensure that my form and everything is going well. Also, I have a core issue that I find gets more easily worked on via privates. I am thinking about doing 1x private, 2x group sessions and 1x mat pilates (at home) for a total of 4 sessions per week. What are you guys doing? If you are not doing privates, why?