I think your full range measurement looks excellent and maybe all you need for the systems on axis response. The rest seem pretty good too. I've had a look at your file and uploading a version of it. The useful measurements with comments are the top four.
Looking at the waterfalls in (3 vie con imbottitura...) , it still looks to me like your absorption is only effective down to about 1.6kHz, which is an improvement but isn't low enough to say for sure whether the dip centred on ~750Hz is due to the loudspeaker system or out of phase reflections...
Firstly, according to the RT60 and RT60 decay plots from your measurement, you're in a significantly reflective environment, you want to minimise that as much as possible. The carpet is absorbing some of the higher frequency reflections but only beyond 8K ish by the looks of it Try putting as...
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