Your M3s would benefit from a tweeter and crossover upgrade. Alternatively, you can trade the M3 for M3v4. You will enjoy a wider, deeper and more satisfying soundstage and imaging.

Compared to the 160v4, your 150 is total garbage. Trade that in for sure.

QS4 are crap compared to QS10. Trade.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated