I played around with "Control Parameters"/"Proportional Gain" and, indeed, it makes auto-guiding work as intended. It isn't yet perfect, but there are other factors at play (my guiding hardware is DIY and needs improvement). Anyway, on a longer exposure I can already see the difference.

Many thanks to all of you, guys, for your help !

By the way, never heard about proportional gain before. Is there any documentation that explains what it does ?

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