Sounds wonderful !
Had you ever considered towing a small trailer rather than using panniers? I have no experience with panniers or with trailers so I couldn't say which was easier, although I gather a lot of cycle tourers use the trailers so I guess they can't be that difficult to tow.
At any rate, have a wonderful time, and thanks for sharing your experiences!
- Jo, who lives vicariously through reading about others' adventures.