I have a long hallway that has 11 ft ceilings, all flat. This was my inspiration photo and I used a smaller version of this pendant (my hallway is narrower) and repeated it down the hallway. I also have beams.

The odd ceilings will look like a design or building mistake. Too bad you went down to 9 ft, as 10 would have given you more options for doing something interesting with lighting.

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Is there a need to drop the ceiling further in?

It depends on how the rooms are shaped and if the "soffits/headers" are at transitions that are appropriate, like in-line with walls.

I can't tell from the framing, but the second space through the doorway in the picture looks like only 5' wide of vaulted ceiling, which would be a sliver in the total room depth. Show a floor plan, that would probably answer what to do.

Do one single height. A mishmash of 1 from each category is a terrible option.

I would go with 9 if that is the highest it can be at some point in the hallway.

We have to drop the ceiling to 9' at the end. I can't remember why but it's probably related to the upper deck above it. Here's the floorplan

There are some odd design lines and nook ceilings making for a very messy ceiling plane. Make the vault shine where it should - in the Living/Kitchen. Eliminate all the vault beyond the hall. Make the entirety a 9'-0" high flat ceiling. That will be one plane. It transitions nicely to the stair as well. Make the cabinet niche (counter or Pantry cabs, don't know) next to the hallway 9' as well.

If your Kitchen cabinets go to 9', even better. For a clean look to fit what I think you are describing, the upper cabinets flanking each side of the sink can be eliminated too.

For the ceiling in Bedroom#3, it can be 9', 10', or 11'. 11' might be too tall for the size of room, and it depends on the windows, but probably 9' is better to match the other bedrooms. Same for Bedroom#2, it has a misaligned 9' section, so the entirety should be 9' instead of 11'.

pick one - go with the lowest and make it work - otherwise it's like those weird rides at the state fair that you bust through smaller and smaller glow in the dark painted squares that makes you freak out.

Does it make any difference that my husband/contractor had all the bedrooms follow the same roofline as the hallway? The bedroom closest to the living room has a ceiling that is have vaulted and half at 10’. The next bedroom has a 10’ ceiling and the master/primary is 9’

This needs to go back to the drawing board for a redesign of the whole.

Yes it makes a difference which is why I mentioned them. The differing heights within each room, including the hallway is the oddity of it all. Changes in plane on the ceiling define the space below it and break up the space. So in one bedroom, you lay on the bed and look up into a vault, but your shins are under a flat ceiling. In the other bedroom, the 9' soffit aligns with the closet (which is good), but slices above the door in the middle.