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After enquiry with the bbPress forums, this is the solution that you put into the child theme, or the css plugin you’ve installed (I use Simple Custom CSS)

#bbpress-forums .reply {
    font-size: inherit;
    padding: inherit;
    position: relative;
    right: inherit;
    top: inherit;
}

This puts the answer exactly where it’s supposed to be. So I call that a win 🙂