Joao,
I have an unconventional x6100 config. I copied the 1.19 app x6100_ui_v100 into the 1.17 app on my radio to get the UI improvements of 1.19 (audio scope on/off, white text - not red) and the functioning CW/RTTY/PSK modems of 1.17 which are broken in newer app releases. I am using base 1.18.
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I wrote my own CI-V test program in Python (if I had known about the KB3HHA programs I wouldn't have needed to). I tested with CI-V Scout and indeed, the radio timed out with address 70. But strangely, it works with my program and a number of apps that use the 70 address (VARAC).
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As you can see in the screenshot below, the second to last command sent was to address A4 and the radio responded correctly with an A4 but the last command sent was to address 70, and the radio responded from address A4! So the radio does run commands to address 70 but responds from address A4. This is probably why CI-V Scout times out because it is filtering for responses from the address you set in the address field, and my program (and others) do not.
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In any case A4 is the proper address to use.
Gary
Gary