Parasound Halo A21 + NewClassic 2125 (Mono) VS A31 for L/C/R

Hi there!

I have a question regards to powering my L/C/R - B&W CM10 S2s and CM Center 2 S2. Currently I have thee Parasound A21 powering L/R and Parasound NewClassic 2125 v.2 in bridged mono powering the Center.

While the A21 is rated at 250 watts/ch and the 2125 in bridged mono is rated at 400 watts, does this make my L/C/R way out of sync or barely noticeable? Will there be  significant difference if I bought an A31 to power all three instead? Btw, the A/V is an Anthem MRX720.

Thanks in advance.