I would vote against Dillingham for a week of soaring. It is strickly a ridge running site and very small ridge at that. I fly there every time I go to Oahu but I am getting bored with the place by the end of a day.

I would strongly vote for Minden (Soaring NV). You can fly just about every single day. The weather in September can be different every day but you have thermals, ridge, wave, and the prospect of some cross-country flying every day. You cannot get bored.