I was in your same situation a few months ago. If things don't work out at Untangled go to Infinity Salon in Cornelius. Make an appointment with Anna Claire. She is really great and will cut your hair like you want it. I have thin hair and she will tell me what she thinks will work best with my length and thickness. I trust her judgment which says a lot. She is super nice and down to earth.
I originally met her at Valeria. Even though that salon is not part of a big chain you will probably feel that the staff isn't very down to earth. I had to go back there (after Anna Claire left) for a product related issue and the customer service was awful. The sad thing is the manager was the one helping me, so I asked to speak with the owner. The manager's response was "she isn't here, she won't be here for a while". I explained to her that that was fine, but I would still like to speak with her and basically she wouldn't get me in touch with the owner of the salon. A business with good customer service would have taken my information and told me that they would have someone get in touch with me.
I have also tried Savvy Salon. The particular stylist that cut my hair, cut it the way she thought I should cut. That was after I told her how I wanted it cut, so needless to say I never went back.
I know how frustrating it is to find the right stylist that suits you so I hope my input helps. Good luck!!