well, pit's upB is workable, i think, in a number of ways.
1. perhaps the length of it stays, but gravity forces the long beginning to be even longer. this way, he could use it to slow his momentum from above, like his glide, but with more options. and if he's recovering from below he's probably going to have a hard time getting back much like the rest of the cast. one hit on it and he's done, so he must recover from a distance away. because of the extra gravity, though, the height gained is less and the beginning eats up more of its duration.
i don't like this one myself. it's the length. watching a character take forever to return slows the game down. pit isn't samus.
2. cut out some of the beginning and the end of it. make it more modest of a height given, but in a shorter period of time. maintain whatever ATs he needs in the first 10 or so frames, since those sound like the key frames in all of them. this way, you can nerf the height gained, but buff the tempo of his recovery. he still won't be easy to deal with, but pit looked originally as though he was supposed to have an above par recovery. this way, you keep that but also nerf it in some regards while making it fit a little more.
some suggestions. of course, yeah, it could be replaced too, if it doesn't work out.