@adamaley
I am asking you some questions. But also making some starements to help others understand what the Eco Flow is all about.
Do you have utility power at the rack to compare?, Are your Eco and Bluetti in the room or attached to transfer switch in the garage?
Do you hear a difference between the Bluetti and Eco Flow.
Did you modify the units any wsy. Change duplx,? Change filter caps?
Do you have a modified cord that plugs into the 30A x 120V outlet that feeds a power strio?
What are your monoblocks? How much power.
Your Eco Flow has a 7,200 watt 240 volt inverter. That means a 3600 watt inverter per 120 volt leg. Or 30A per 120 volt leg. A respectable amount of power. Especially if your using the 30A x 120 volt outlet designed to connect to a RV. The others are probably fused at 15A x 1800 watts.
Did you ever bring deficatef #10 wires to your rack or are you plugging into a builder grade outlet and branch wire that would most likely be a undersized #14 with many breaks around the room. Not that this is bad for a comparison. Its just a testiment to a solution of fixing builder gade wall power. You do not have to tear apart your house. There are options.
Thanks for your time.