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The adaptive limit is thing means that the controller cannot lean the system out enouh, ie - always too rich....
sounds like a fuel injector or two is stuck open.
There is one way to test, put a fuel pressure test gauge on the test port on the fuel rail, run the engine , shut it off and see if the system holds pressure. Unfortunately this will also show if the regulator leaks down or the fuel pump check valves leak back so it is not a 100% test for a leaking injector, but given your symptom, it is very likely.
If you haven't found your way to ford-trucks.com, do so.
They are some of the best ford guru's I've seen; F150 myself
Cheers,
Popa Tim
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