You want artists to draw 40-80 panels a week for no money initially and then when it earns money, they'll get a percentage share with a team that includes two editors, two proofreaders, storyboard artists and presumably at least one writer, and maybe others? If there are 7 people on the comic, the artist will only get about 14%. Assuming that to create 40-80 panels in the style of the webcomics mentioned (which have very high quality and detailed art), the artist will need to work full time on these comics and so earn a full-time wage for it to be possible (because if they have a job, they just won't be able to produce that kind of output), meaning that each of your series will need to make an income in the region of... $140,000 per year.
....This doesn't sound very feasible for a first project from creators with no established fanbase or proven track record. I'd urge you to reconsider how you're going about this.