There's an issue of fluidity. You may have a well chained combo, but the movements in themselves aren't. The reason why this happens is that there isn't a coherance in the motionpath as well as inconsistency in spacing. Sure, imperfection leads to perfection, but your sort of imperfection is more destructive than constructive. What I see is this
when it should be more like this
Difference between the two is consistency in spacing and curviness of the motion arc. Of course, there are variations, but the idea is that if there is no degree of curve in your motion arc, you're probably doing it wrong. Fixing it is as simple as aligning the body segments according to the arc.
If you're unsure of what a motion arc is, do watch this video
Combo-wise, you've go the right idea, so just try to work on your fundamentals. Hope this helps.