@shalommorgan I have a room with very similar dimensions. What areas did you discover had the highest bass velocity or were the biggest problem areas?
For me, the corners behind my speakers were the biggest problem so I filled them both to the ceiling.
My biggest problem area is the mid bass above 100hz has a wide dip. It's the ceiling interaction...possibly combining with the floor reflection. If I take a big trap and hoist it over my head (and speakers) during a measurement, it mostly goes away.
One day I may do a cloud with an attached scatter plate to deal with the floor and ceiling reflection dips.
I keep a door open behind my listening position and that does a surprisingly good job of reducing bass build up..