In the photos provided, I see very few yellow leaves and I'm wondering if we are trying to a solve a problem that doesn't exist. Philodendrons will develop some yellow leaves occasionally, especially as they age and if they are allowed to grow freely and never pruned.
Your hanging plants are too high and too far from the windows for there to be too much light for them. If you keep the shades down during the day, they will eventually suffer from inadequate light. Unless room temps are above 90 degrees F, then that is not a problem.
I don't trust moisture meters as they are notoriously inaccurate and can be misleading, But if your Philos are healthy and you have been using the meter to gauge your watering, then I would not change anything.
