A bi-amping question

Right now I am using a Bryston 4B-ST for left/right channels in home theater. For center channel I am using an unmentionable monoblock. What I want to do is take my Acurus A125x5 amp that I have just lying around and bi-amp the center channel, using 2 of the 125wpc amps. Will this create the appropriate sound pressure level to match my Bryston?--or am I thinking about this the wrong way. Yes, eventually I will upgrade to all Bryston amps, but for now, I NEED to get the center channel level up. I do not like the result by boosting the level using the processor. The center channel is taking about 70% of the sound for movies and boosting it is just making it worse. For reference, I'm using B&W N804s for left/right, HTM-1 for center. These speakers matched for size, efficiency, frequency response and driver compliment. The processor (Proceed AVP) has only one center channel output, so I will have to find an IC splitter. Thanks.