I watched the video and wasnt sure what to say about it, but reading some of the other posts helped me to pinpoint it.
In your original post you talked about your concern with regard to him bobbling his head. And I think it was Spyder who said that you never really had the horse settled and that he was looking for direction.
I think the way I might phrase it is that he is kind of bumping around , bouncing onto and off of the bit and your hands , as stated by others, are not as stable as you hope (and they will be someday). And since you aren't followind his mouth well enough, you are missing the milisecond when he does come to the bit. If you could find that place and kind of "take" him there and not allow him to change his mind about contacting that bit by bouncing off. It's kind of like fishing; when the trout bite's you need to take up the slack and play that fish, keepig the contact firm so he doesn't get away.
Except in the case of the horse, in order for you to get a better feel of the opportunity, you have to drive him more rythmicallly forward and not let find a loose place to bounceoff the bit.
So, you put your legs on, push him forward a bit more and kind of catch him on your outside rein. Once he is on it, then you can ease out a little of the contact and encourage him to reach forward.
If you raise your hands a little you will be better able to connect them to your stable core. Your upper body seems pretty firm. The horse will need to raise his head a little too, and again, after he is steady on the bit, you can allow him to stretch out and down a bit.
This may be off base, but you might try shortening your stirrups just one notch. See how it feels. Might offer more stable base of support.
I think you guys a cute pair and you don't seem like beginnner to me.