you have an error in your vortex,you must wait to the 2nd diabolo,check this video(is in spanish,but you can see and understand)Tutorial 2 diabolos Vortex Español
You're doing a short sprinkler. This means you are doing a vortex with one diabolo in a right front wrap, and when you exit, you're re-wrapping the same diabolo that you wrapped for the vortex. With a long vortex, the one shown in hookers video, you re-wrap the other diabolo, This means its a little longer (hence the name) as there is one extra beat of anti-shuffle before its re-wrapped. Does this make sense?!
its all just practice my friend. At least now you know the differences.
but how to make the fu***ng wannabe bird diabolo stay on the string then!?!??!
You're going to hate this but practice.Oh and widen your hands for mini columns while your at it, when you think you cant make them wider go wider still. Work on pingpong and other string control stuff (including diff entries\exits) and this should help your control over the aviastic diab (tbh if you can fan and minic it shouldn't take you to long to get the long one)
use really strong hand movements for mi columns, not relaxed