In Bracket 1, the ninth and tenth place finishers drop one bracket to Bracket 2. In all other brackets, the eighth and ninth place finishers drop one bracket, while the tenth place finisher drops two.
Most of the time, the bracket winner advances two brackets (Bracket 3 winner does not, tho), while the second place finishers advance one, unless there are “dominant performances” by bracket winners that out jump the second place finishers.
If you think the current system treated your guild unfairly for finishing eighth, @peacefull imagine finishing second and not advancing while guilds that score 0 only drop two brackets.