Nope. Hard loads are usually when you drop quite low (lower than 4ohm, way lower than that) in the bass register. Then you need a lot of current. Many sweet sounding amps just sag, then. Those situations need muscle. The Infinity Reference 253 just need an amp with a response that does not depend on the impedance at a given frequency, not a muscular amp.
Hm but maybe a powerful PA amp at the bottom with a lot of current, which takes care of sub bass? Which is built like a tank to withstand tough battles (live, on the dance floor and so on). Which has a high damping factor, a lot of power, which can handle low ohms and so on. Okay, it may not be "nice" home hi-fi, but more about brutal power, but it's perfect for the lowest frequencies. In addition, it relieves the other amplifier then.
The crux is probably these damn fans, but if you can throw such a war horse into a closet (if you can solve it with cables) then the fan sound should be gone...maybe .... Just a thought.
It is possible, if they fit with power and efficiency, install quieter fans.
Edit:
By the way, this is the solution I am building together now. I am not the first to get a solution, rig based on it. PA amp plus subwoffers and maybe, maybe PA5 in the top speakers. I have to think about that.PA5 does not have the same quality in the highest frequencies as a well-built AB, but for me it does not matter. I have a built-in LP filter in me. As by the way, it also changes gradually year by year.
When it comes to subwoofers, it's more about NAF. Neighbor Acceptance Factor.
Edit:
Nothing new under the sun. Billy Gibbons explains how to combine two, 1:00 into the video. How the response, the answer should be in a sensible way 1:35 ..
Sorry, could not help but get a little silly.