[Part 1 of 3]
I've found in Sephex, Sophex, and A9S, usage of the raid finder queue to get a first clear is severely impaired.
1. Nobody uses Duty Complete >> Practice
2. Almost nobody uses Duty Incomplete >> Completion / (Practice >> First Phase / Second Phase).
In the latter case new people clearing things are thinning down, and Raid Finder is impaired in co-ordinating them across servers.
This means that most first clears (the last two weeks at least, and the problem will likely get worse as time goes on) are from partyfinder groups.
The reward system also severely impairs clear-party groups composed of people of mixed status (say some who have not had weekly clears but have had first clears, some who have not had any clear ever, and some who have had weekly clears). Mixed-status first-clear groups in PF are far more common than all-new groups, and simply cannot use raid finder at all, under any option, if they do not have 8 members.