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To not get things more complicated than it needs to (for a novice like me at least):
It could be of benefit to shift the exhaust and intake cam symmetrically, e.g. if you reduce your exhaust retard value, add same value to intake advance. Then you don't change the duration of the overlap event.
Think of an old 2-valve engine with a single cam.
You're just trying to close the exhaust valves soon enough to prevent the loss of the charge where the lean spikes are.
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