I separate the issue of trim and outer limit. I start by setting the outer limit to just inboard of where the chain would overshift otherwise. (outermost workable position).
Then when setting th cable length, I adjust the trim so the cage's outer plate just clears the chain when coming form the outermost sprocket (innermost, non rubbing trim). This will give me the most latitude for chain clearance of the inner plate when coming from an inner rear sprocket.
Usually (not always) this method, has the FD with a bit of overtravel beyond the outer trim position. That's OK because it gives me that extra bit of aggressiveness when shifting.
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