Ahsoka's two handed blade form is actual well balanced .... in the cartoons
Her form is based around defensive blocks with the sabers while simultaneously fighting with flips, kicks, and the force. The problem with this adaption is much like Yoda in ep 2, you can't really do her style justice outside of the cartoons and CGI effects. It's honestly too cartoonish for live action.
I will say that the younger actress playing Ashoka in the flashbacks seemed more relaxed than Rosario with the two Saber scenes. Rosario looked like she couldn't wait for something to happen so she could go back to single sword choreography.