Problem: People queueing for this raid are seperated into 2 groups.
group1
smaller than group2, slower queue times, unexperienced, lower gear lv. much more likely to fail, doesn't have a choice but would rather be with group2.
group2
larger than group1, faster queue times, experienced, higher gear lv, much more likely to succeed, have a choice and would rather stay in this group.
Solution:
remove the " Complete" & "Incomplete" options from raid finder. Queue everybody together. No more bottle neck.