So you have two integrated amps. You are using one as an integrated and the amp as a monoblocks… you are only using the second as a mono amplifier?
Ok, with nearly 100% certainty that is not optimal use of funds. First integrated amps are a compromise by putting so much circuitry in a small footprint. Then buying duplicate preamps… then bridging… yes, that is not optimal from any point of view.
I would skip the integrated if you have room. Optimal would be something like a $8K preamp (personally I would get a used Audio Research Reference) and a $10K stereo amplifier. That should be a huge upgrade.