Glad you solved 
I think your problem is “animation-related”, I don’t think it’s about the skeleton: skeletons are simply moved using animation data, going through “key frames”. Between the key frames, UE4 interpolates the movements; so you have always smooth movements (to avoid a smooth movement, you must have an animation that explicitly disable it). If the skeleton is wrong, you would simply see something like a “monster”, smoothly deforming itself - but always smoothly, with no “pops”, due the above interpolation formulas.