I am by far a coop builder or designer

I can only give an idea or two of what I would do. I would place a board inside the door to provide a lip to help hold the bedding in when the girls scratch around- it won't stop it completely, but it may reduce the amount that gets pushed out. Depending on the size of the board you may have to re-adjust where the ramp attaches.
Thinking out of the box here, you don't have much overhang on that side, so I can see where rain/snow would blow in and you don't want wet bedding. You could extend the overhang on your roof or add an awning over the pop door to help shelter that(?) I'm sure someone else will have a better idea.
Now, for me - I like to have an actual door in that opening to make nighttime even more secure - doors are secured and windows have 1/4" hardware coverings.
I'm not nitpicking your housing at all, but your fencing has large spaces where a small predator could get into the run and enter the coop unless there's a secured door there.
This would also block nighttime drafts/wind so your roosting ladies are more comfortable.
Just some thoughts.
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