when you say 'regular', i think you are actually trying to belt too high. a properly shaped and resonated head voice can sound like a powerful belt. you definitely want to be in head voice for all these notes. but even in your examples of head voice, you seem to be pushing/ straining/ pulling chest. the E#4 was the closest, at 1:02. finding the lowest head voice is difficult, and it would take a whole lot of explaining to explain it, so ill give an example. listen to the song 'God only wants you'
(and appreciate that Screaming D5, one of my favorites)
Jimmy Gnecco sings this almost completely in head voice, NOT falsetto (it does sneak in, but if you dont hear any breath its not falsetto). try to sing along and sound like this, and sing to other songs and sing it like this, very very light. you should get to a point where you can take this light sound all the way down to a soft chest, and get a seamless transition. notice how the resonance feels when you sing this. the stuff you will have trouble with, the resonance will be about level with the top of your jaw, the higher stuff where the resonance is behind your nose-ish is easier. but overall it should seem soft and ringy. singing with that big belty sound in your head voice feels just this easy. what you want to do is focus on the resonance and keep it there, while employing the shaping of the mouth, leveraging of the tongue, and all that intrinsic anchoring. ill go out on a limb and say you will know when youve done it right.
the most important thing is connecting this soft sound seamlessly with a soft chest voice. then you can feel the resonance and see when it changes from chest to head. (since its slightly different for everyone). the lowest head voice notes, when you are finding them, will be very very soft, almost falsetto. you cant be trying for a more powerful head voice like in your clip. the power comes from the shaping and anchoring.
hope that wasnt too confusing!