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For a start, if you are racked out to 600mm without the TC, you are at f6.3, not f5.6. So with the TC on, you are at worse than f8.
You would get far better performance and as good or better IQ shooting without a TC and using a 7D2.
However, with good light, you may get good enough AF for tracking planes. I doubt the dock customization would help much, but that is JMO.
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