I think the lead vocal should sing it something like this: CC CC CC EE AAG Next repeat: CC CC CC EE AF AA.
Each note equals a word.
The harmonies are a bit harder though, I'm toying with midi now so that doesn't help either haha. I was thinking unison the first 3 we rocks, the lead takes that E. Then go all out on the harmonies in the double kick repeat.
That was just an idea though It would've been so much easier doing this in person, there's so much trial and error for these kinds of things.
About the falsetto: