I am with @Gaston_Jauregui
here. You resonance isn't quite there, so your sound isn't very bright. I would stay in Volume 1 and keep working on getting the ping sound in your scales. Once you get it in the scales the transition should be automatic to your singing. Also as @Gaston_Jauregui
said your jaw needs to open more.
What I will add this. It seems like you are actually forcing your jaw to stay closed. I think that this is where the jaw tension is coming from. It also seems like you don't have a fully open throat. My feeling is that you feel like you look clumsy or strange by opening your mouth and ultimately your face up so much. I think it is the contradiction between that and what KTVA is teaching you that is causing you to try to comprise which is manifesting itself as tension in you face/jaw. I don't think that singers look strange when they open up when they sing, to me it gives the impression of passion. Also, the truth is nobody is going to be looking at your face when your voice is awesome
Another vibe I got from you is this. It seems like you don't trust your singing. I can totally relate to this. The truth is that you sound good. You need to let go of the things that you were, and embrace what you are now, and what you are ultimately becoming. For you to take the next step you have to be, for lack of a better phrase "Comfortable in your own skin". This is going to require some introspection and some honest appraisal on your part but if you do it and you are conscientious then you will reap great rewards. Please don't let honest appraisal go through your mind as self flagellation, I mean it to be what you are strong at, and fearlessly accept that.
Hope that this helps you on your journey.