I think I know where your trying to go with your system. But you should consider auditioning these amps. Synergy is key. I have not auditioned the Belles but can reference my experience in using monos with two-channel stepup versus single amp.
With monos the soundstage and imaging is improved, offering better soundstage width and depth. I have a smallish room with a short wall setup and I notice the depth easily as improved. Instrument placement and layering are also more accurate, revealing the depth and texture of each instrument. Prefer instrumental music and find this to be true with percussion, guitar, and piano. While not a huge fan of vocals, vocalist have much more richness and depth. Bass performance is remarkable with low level details. Depending on the recordings my Dalis can dig a bit deeper which is not bad for a six inch woofer.
With monos the soundstage and imaging is improved, offering better soundstage width and depth. I have a smallish room with a short wall setup and I notice the depth easily as improved. Instrument placement and layering are also more accurate, revealing the depth and texture of each instrument. Prefer instrumental music and find this to be true with percussion, guitar, and piano. While not a huge fan of vocals, vocalist have much more richness and depth. Bass performance is remarkable with low level details. Depending on the recordings my Dalis can dig a bit deeper which is not bad for a six inch woofer.