I've played ancestral ruins pretty frequently and enjoy the game mode overall. I have noticed two things that are consistent issues.
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Failed boosted drops for specific schools - the current supposedly boosted drop in my server is for summons. I am on Level 4 and went through two rounds without getting an option for summons in any manner. If summons is supposed to be a boosted drop rate, that should not happen. But what I have noticed is that the "new" schools are dropped much more frequently, almost in every opportunity - unless it is the school you are currently using. When it is supposed to be thunderbolt boosted, I will get every burn and iceblast available, but rarely thunderbolt. When is switches to burn, then I get the other two. There is certainly something wrong with the set-up.
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The second issue is that I frequently fail to get the promised number of selections after a victory. For instance, I can choose to play a boss that gives 2 drops and I only get 1 or a final stage boss that promises 3 drops and only get 2. I get at least 1 every time, but frequently fail to get all the multiple ones promised