I'd be curious to hear your thoughts on using an early tap. I know Valerie Liukin is a big proponent of it and I'm not clear why. Nastia did have amazing tap swings even though she started at almost 3 o'clock.
It is the wrong tap to use for 90% of the athletes 90% of the time. An athlete must have great thoracic mobility and shoulder flex to use this tap long term. Valerie said that he teaches the tap in a natural way without a low rail... he then transfers it to the uneven bars. My daughter started with this same exact tap as she was short and could not reach the low rail... then she started going to the invite camps and working with the national staff including Valerie. Her tap was transformed to an above the rail tap. At one time... my daughter could tap just like the video of Nastia that you posted. It took a lot of work to maintain this tap swing on FIG bars as she grew. My daughter ended up not having the thoracic mobility to do this tap.
Here is my little homemade test. In order to do this tap... have a gymnast lay on the ground on their stomach and push out long. They need to be able to lift their arms and chest up off the ground to 45º or above without lifting their legs or feet. This is what creates the great "drag".
What you said about the head being in intrigued me. My daughter is constantly being reminded to keep her head in but it doesn't seem to be working for her and it seems like she is having issues keeping tension on the bar. Could you elaborate on what you mean by it's harder to pull on the bar with the head in? In what phase.of the swing?
We teach kids that a "tap swing" and a "giant tap" are different. In other words... we teach that the singular tap swing the hits the thighs on the bar is the root of the giant... not the repeated tap swing.
Below is a screenshot of Natia's tap swing (head is in... no angle in shoulders)...
Here is one from a giant (head is out... angle in shoulders)...
This is one of these things that "everyone" seems to agree on... the head should always be in on the up part of a giant... however... it doesn't hold true in upper level uneven bars at all as you can see above.
Gabby Douglas keeps her head in really well...
Others... not so much... just look through all your favorite bar routines in slo motion and see what you find.
If you bury the head... you cannot see the bar on the way up... this is not always the best case scenario. Sometimes seeing the bar earlier makes the next skill easier.
Where is she having an issue keeping tension? On the front swing or in the back by the low rail?