How much acoustic room treatment

I purchased treatments from a magazine recommended source. I installed about half the panels as was recommended. Although the sound stage improved and echo decreased, i found the warmth of my tube amp decreased. Is there too much treatment in the room or do i now need to play with speaker placement to return that original sound?
the most significant change when installing the treatments were the stacked, 2 on each side total of 4, behind the speaker, in the corner behind speakers, bass absorbers each measuring approx. 2’ by 4’.
txs.