My closet is open on the top if you can picture that. It shares the same air as my bedroom. My closet door is shut and locked though. I have my 6" intake on the floor up against that closed door with a gap under the door which draws air from my bedroom also. Then I also dropped a 4" line from my central air directly into my tent.
I am thinking I would have to buy a decent sized dehumidifier to remove the humidity from my room, which the door stays open to the rest of the house, but at least it should remove some moisture and hopefully get my humidity down in to the 40's that would match well with my higher temps with lights on to get me in the green on the VPD chart. I'm just wondering if it would really make a difference, I think so. But would it make it dry, and maybe cause dry throat and eyes? Guess I won't know until I try it. I am looking at room size dehumidifiers in Facebook marketplace. Might give it a shot. The flowering VPD char is different than the vegetive VPD chart.
If you scroll down on this page you will see each plant phases recommended temps and humidity for optimal growth. I am sure you have looked at it before.
https://pulsegrow.com/blogs/learn/vpd-charts-in-fahrenheit-and-celsius-with-leaf-temperature