When you TK from the left side, your thumb can easily skip the down-left position. For instance, with Johnny, 412369 can easily end up being 42369, giving a super jump H instead of an instant ensenga. The only way I can see of dealing with it is making sure the thumb holds left and down before finishing the motion. With quarter motions from down to up right its the same thing on a pad, gotta make sure your thumb holds what you need held down before going on, if you can help it. (im assuming your just missing an input. amI right?)