I wouldn't think Oct/Nov are peak Hawaii times unless you are looking to go during school breaks (Thanksgiving in particular). We booked June at 6mo, which seems to be a peak mo because there wasn't much available. The other thing to look in to is whether there are specific Japanese holidays during that time. That could impact you.
Otherwise, if you are flexible on start end dates and view type, you should be able to find something. What are you specifically looking for?