Listening room ISSUES

Hi first let me introduce myself I'm new here and my name is Scott I'm 63 and I've been an audiophile all my life. I recently moved here from a place that had a dedicated listing room it was perfect 24 by 36 and a ceiling 12 ft high. Now my room is and likely will forever be 11 ft 8 x12 ft by 7 ft 8 in tall
One of the 12 ft walls has a door 3 ft from a corner and two windows in the other corner the other 12 ft wall is only 66 in Long with the other eight plus feet as an opening to a room that is 9 ft deep because of the opening on one 12'wall and a door on the other 12' wall I sit on one of the  11 ft 8  walls . I don't have the correct measuring equipment but I did go in a room  calculator and a speaker placement calculator and and even where I am forced to sit I am backed up to a wall literally a foot behind my ears the room placement calculators indicate the speaker should be about 4 ft apart 4 ft from the sidewalls and about two and a half from the front wall . I I really need to draw this . Initially I was sitting against the long wall . But living in the northwest when spring came I wanted to look out the windows so now I sit on the short wall.  This room has standing waves that are certainly higher than the tallest wave ever surfed. The base just overwhelms the mid-range I have tried room treatments for early reflections and The comb filtering I've been binge watching studio room treatment experts and this room breaks all the rules . My equipment is . Techniques SL-D 202 Shure M91 ED . Dennon PRA 1100 pre amp. A Dynaco VTA ST -120 I put the kit together in 2011 . Klipsch kg4 . I use a crown XLS 1502 with the  internal high pass filter at 60 cycles. Running a JBL 2445 H in a DIY 12.5 cubic foot enclosure tuned to 30 cycles.
I built it for the Klipsch LaScalla that I used to use in my old place. Yes I tried the LaScalla and you can imagine how that went.
But in my defense they still sound great in the front yard.
 I don't have a clue what to do. I have thought about putting my back to the open Wall but it would leave only 30" to get through but I am going to try it out if anyone thinks it's worth a shot . Thank you in advance for your help 🆘. Please excuse my typos .