The most bizzare and plain crazy tweak that I know is disassembling the system. And I do not mean pulling out your interconnects and speaker cables.
You will need to get rid of the boxes and break all your equipment to pieces - transformers, circuits, anything which is possible - take it out of the boxes and hang it all independently by elastic stripes ( the longer the better, ideally they should be fixed to the ceiling) all these parts should be connected by wire, which is supported the same way. All connections should be hardwired and soldered , no jacks, no RCAs, nothing like this. Effectively it will be a skeleton of the system with all the parts hanging in the air. It will sound like nothing you have ever heard before. How about that for a crazy tweak. I know a man who actually did it. And some more, I will not elaborate here. It requires you to know very well what the hell you are doing.
I have to add that it may be extremely dangerous, and breaks all possible UK regulations, so please, please do not do it at your home.
Good Lord! Now that is planet-jupiter-extreme! I'm sure there is some rational explanation why this should work?