The next step for control room treatment

I've designed, built, and treated a new control room, and I'm at the point now that I need to do some fine tunning. I moved everything in, and started listening to some music. It sounds pretty good, but I noticed a little weirdness around 100 Hz Room size: 9.5 feet high 10.8 feet wide 13.2 feet long So I ran fuzz measure, to do some testing, and sure enough I have a dip at 90 Hz, and a peak at 110. See Attached. I am forced to set up my listening position width wise rather than length wise. (I don't really have any other speaker placement/ listening position options) I am set up so that I am listening at about %38 of the room depth. So here is my question: Should I continue with more broad band absorption ( even though Every possible corner, front wall, and initial reflection points are treated with broad band 4-6 inch panels), or start treating the specific frequencies. How would I do this? Thanks

For a room that size you want broadband absorption only - the more the better. --Ethan