Peter,
Indeed, often correct explanations in Physics turn out to be ridiculously simple.
In my 2012 FQXi essay titled "A Classical Reconstruction of Relativity" I show that length contraction (and mass increase too as a result) is caused by Doppler shifting up the upstream and downstream components of matter waves.
I have found your past essays, and now your latest one, very interesting and helpful in advancing our understanding of how the EPR experimental results are obtained by the combined effects of polarizers and photomultipliers resulting in a cosine squared dependence on angle. My essay this year titled "A Fundamental Misunderstanding" addresses the EPR result and shows conclusively that Classical Physics can fully explain the result, even for the latest 'loophole-free' Steering Inequality experiments.
Best of luck with your essay...
Regards,
Declan Traill