This is shaping up nicely! Thanks for the incredible help!!
I will definitely work on the speakers placement in the room now. I haven't paid much attention to it. I've recently bought better wires and wow, wouldn't have thought they'd make that much difference (I was using really crappy ones and not even sure they were speaker wires).
My shortlist is MA Silver 300 (999$) and the QA 3050i (650$).
I've just bought the CXA61, which exceeded my initial budget, so I will stick with it for a while. It was the best amp I could afford here in my country, the others were above 5000$, nothing in between. That's way beyond what I could spend on gear unfortunately. Maybe next time I travel to Europe I could upgrade my amp but meanwhile I'm happy with the CXA61.