You have written an excellent review of the problems of quantum mechanics and it's interpretations. The comments that you have received are also very insightful. I have come up with my own interpretation, "The Karpinsky Interpretation of Quantum Mechanics", here in Medium, and if you have the inclination, I would be interested in your ideas of where I got it wrong. I can't remember at this moment how to make a link to my article, but you can look it up. Also, "The Transactional Interpretation of Quantum Mechanics" by John Cramer is very interesting and I don't understand why it has not gotten more traction in the Physics community.

"When we consider dark energy, the energy density always remains constant." You provide no experimental proof of this. Also, you don't answer your own question. "As The Universe Expands, Does Space Actually Stretch?" There is something very wrong with our picture of space and time.