I have suspected that dark energy (probably a misnomer) arises from a ratio of lengths since about the fall of 2012. I have periodically tried to improve the theory and argument. I posted a paper on RG on April 19, 2019 called Size, scaling, and invariant ratios
Preprint Size, scaling, and invariant ratios
which attempts to simplify and generalize the theory. It seems to work. Even if it is valid, at best a way station on the way to something better. And no matter how much a theory might seem to cohere, there are always many ways for things to be wrong. If you have time, do you think the ideas make sense?