That's because there aren't really that many "set" routes, more like rules of thumb. If you're close enough to the corner to get a double alpha, you want to keep your combo meter at 7~8 or less before you go into the alpha blade. If you want a knockdown from a normal launch, j.P j.P j.K(2) j.D works on every character. For dusts, j.D j.D j.D j.S dj.S tj.S j.HS beta is about as good as it gets. If you really need that last ounce of damage, lots of j.Ps and j.Ks jump canceled into even more dj.Ps and dj.Ks and so forth. If you absolutely need that knockdown or those last few pixels of damage, tack a ryuuyanagi (the shuriken air super) onto the end for a hard knockdown from any height.