Proac owners......advice please

I am runinng an all solid state Electrocompaniet system; DMB 120, 4.7 Pre & EMC MKII. I recently purchased a pair of Proac 2.5's.

I will tell you that the speakers now have about fifty hours on them. Cabling is all Nordost Red Dawn at this time. The room size is approx 17'x 24', with a 12' cathedral ceiling. The good; we have big sound stage, we have wonderful mid range with very good rhythm & pace. Please play the Dixie Chicks again!
The not so good; The bass gets dominant from time to time. I won't say that it's boomy; it's like blowing a low note through an empty paper towel holder. The highs or vocals during the playback are just not on the same level when this happens, & my ear goes straight to the bass. I might add that the vocals could be a little smoother. Maybe my room is the problem? Maybe the speakers need more break-in time?
Before I consider room treatments & the likem,has anyone experienced a similar situation or could you suggest a different cabling option? I am fairly new at high end passion...so I really need someone that is famliar with these speakers or has owned solid state with the Proac's- what have you done to get the best possible sound out of them?
I know many of many of you state that Proac's sound is the best with tubes --and ARC is also a great match. I did try an ARC LS 16 pre this week with my amp, but the match wasn't that great. I do think that I would like to stay with solid state for a while, but I am hoping that you can make suggestions about how to achieve a better sound quality with my current components or alternatives that will enhance it. Thanks!