Becky,
Fab, you've achieved what you set out to do on an important subject.
Great set of words and production.
My highlight was your singing on the verses. They really had an edge and loved your tone.
Indeed my only thought is the difference between that and the chorus where you have your backing vocals as the substitute for a choir. I think I'd keep the backing vocals as its that and put a lead vocal over them too keep the power.
Great stuff, look forward to the next.
Neil