Hi Jimster,
While i've never attempted to obtain award seats on those routes, some things to consider are:
1. Number of flights per day F9 offers on those particular routes. 1X a day service will net fewer redemption options.
2. Travel dates. Holiday travel...tougher.
Like most other programs, its always better to be flexible. Since you need to call f9 to check availability, have at least a couple options in mind - dates/times/airports.