With Fortune10 on the meshes (kinda cheaty ik, but if you have a mod that can do that...)
sieves will overflow and drop the items on the ground, any possible way to work-around that? e.g make the sieve auto push all the items into a adjacent (diamond)chest or so.

Rather than adding a new feature for weird edge cases like this, Fortune should probably be fixed to not fill your entire inventory on higher fortune levels. #186