I too am trying to find out why my sites don't get refreshed more often by the FAST webcrawler. This summer they announced that they are refreshing their index every 9-12 days, but even though my sites are well represented in their index, I don't get refreshed very often.
Here's what I've been seeing: a small (test?) crawl in September (9/7-12), a full crawl in late September (9/21-10/3), another crawl (with FAST-WebCrawler/3.3) in mid-October (10/19-26)), and what seems like a full crawl starting yesterday (11/13). So, basically one crawl every 4 weeks.
What is everyone else seeing? Do I have to do something special to be refreshed more often? Should I submit my URLs every 9-12 days?