Can’t answer ur q w/o working the room itself.
It’s like asking which chords should b chosen 4 a hit record.

A few tips:

U definitely have got some standing waves in ur room. That’s bad 4 U.
Try stacking some equipment cases diagonally against 1 of the walls. (If not building a diagonal wall…)

In order 2 kill peaking fq, take a large cardboard plate, play the offending note and move the cardboard around. 1ce the cardboard vibrates, stop and fix it @ this point.
Repeat till the spectrum sounds better.

Peace,

Zooot.