Damn' I don't think I got much chance, unless u get some corner bass traps, some thick blankets 10cm away from the wall... and maybe some defration pannels!

U got 3 probs...
One speaker is agains a corner which sort of amplifies the bass by somethin like 12 db

Each side of the stereo field will have a different response cause each speaker is placed differently and has different object/ walls/ obsticles close 2 it!

Speakers 2 close 2 the wall ... early refletions are 2 fast thus integrated in the sound, i.e. actively changing the sounds character!!

Z