Ok,
you need to run room-sense 3 times:-
1. Theatre + BL28 selected (video), preset 0
2. Theatre only selected (centre) preset 0
3. BL28 selected. (Music) preset 1 or 2?
once calibrated, you can rename all three listening positions (say Video, Centre and Music)
you can further refine each of these >>
listening positions >> default speaker >> speaker preset.
The speaker preset in the BL90 (don’t know what they are in BL28), activates the beam control. 0 is auto, 1 is narrow, 2 is wide, 3 is omni. BL28, I am guessing 0 = auto, 1 is narrow and 2 is wide curtain.
if you can get here, listen to your sound. I suspect you are listening to music with theatre + BL28 giving overwhelming bass. By attempting what I have stated above, this may separate the theatre out of the equation for music and listen with BL28s only. You can then play with the tone settings per my original reply.
Additionally, you can program different sources to fire with different speaker combinations. MyButtons feature, automates that fully for 4 sources.