If you want to make Rin ENG sound more fuller/more emotion/not robotic you can do some combining vowels phonetics. Some work well together so you have to do trial and error until Rin sounds better.

Even Dyn/Bri/Cle could help her out too. With some hints of GWL on some notes to help make her sound powerful (well, not super powerful, but it is something).
I also think some sentences should have been changed up a bit to help Rin sing smoother.