Seasonal pitch change:

[Ron Nossaman]

> Then perhaps for long term stability the string with the shortest length
> should be tuned first, followed by the next shortest and finally by the
> longest?

It wouldn't help at all. When the humidity effect du jour 
changes all the string lengths in a unison by approximately 
the same amount, the shorter overall length string will still 
go out more than the longer because the change in length is a 
higher percentage of the overall length in the shorter string.
Ron N