SF Flyer,
Ignore AirWillie, there is not such thing as being over qualified for Ameriflight. With your time you could easily step into any of AMF's turboprop fleet. Just as Ziggy was saying BFI goes very senior, at least it has been for the past few years, and it may take going to another base to get senority to get back to BFI. AMF has a reciprocal jumpseat agreement with Southwest Airlines, so getting around the country is not that difficult.
If you would like more info just PM and I would be happy to answer any other questions you may have.
freightdog