I agree, it was the same for me when I started seeing T2. The consistency was alien and I equated the appropriate boundaries with a lack of connection.
But actually as time has gone on its been incredibily helpful to have a different type of relationship. T2 never brings drama into the relationship and he always owns up when he's in the wrong. I don't feel as strongly about him as I do T1, even though I've worked with him longer than T1, but I've come to appreciate the relationship and use it in the most beneficial way.
I think the testing of your new T is a very natural development in the relationship. Ride it out. If she's a good T, the relationship will probably benefit and that can only be good for your therapy.