I think I see why the lower parts of your plants are '90% shaded'. I just peeked at your journal and don't see any reflective surfaces around your growing area. Where is the mylar, white paint, or panda film?
The pic below is from a while back so I don't know how far they were into flower, but right around that time I'll pull a few lower leaves to increase airflow and guard against pests. But even if I don't yank them, I've hung a reflective surface and use reflectors with a lot of penetrating power so those leaves do get a measurable amount of light and stay healthy until the end. My area there at the canopy is about a meter wide and 2 feet deep and I can grow golf balls down low if I chose to keep those bud sites intact. I don't like to do that though for reasons previously mentioned.
Point is, I think you could make improvements to your growing areas which may make you rethink your shade/shaded leaves information.