Speaker recommendation for mc452 and C2600

Recently upgraded from ma6600 to mc452 and c2600. (about 3 weeks ago) Not happy with the new sound I'm getting. 
I have vienna acoustics Mozart grands and REL S5 set up in my basement dedicated theater room.

I listen mostly to classical, piano and symphony. 
This is my second system, I kept the ma6600 paired with mcd550 and VA bach speakers in the living room. 

The sound Im getting is less detailed, lacking lower end control and overall very bright and unpleasant highs. Definite listening fatigue after about half hour.  

Do I need to upgrade my speakers? I feel my speakers are the weakest component in my system. What would you recommend for my music tastes and 6-8k range, new or used. I'm thinking I should avoid rear ported design as I need to place them close to the wall. Also, aesthetics are very important, that is why I picked VA initially.