Ok, so I've been using Ortega an 2x2 for a while, and there's a case that I have a bit of trouble on. It's where the entire top layer turns out to be solved, but the bottom layer isn't. If the two pieces on the bottom layer are diagonally switched, I'll usually just do an R2 F2 R2 and then a y-perm, but I end up having to just do an x2 or a z2 when the two switched pieces are adjacent.