Trial Chamber Suggestions

After playing through around 3 of the trial chambers with 1 friend, I found the loot to be too rewarding for the difficulty. Even after drinking a Bad Omen V potion in several rooms, the loot seemed to be great, although the fights were too easy. I did the fights with iron gear on the first few Trial Chambers.

What I suggest is that ominous keys should be made rarer or that the ominous fights are made more difficult.

Also, I don't understand why there are two separate types of vaults. I know that the ominous vaults are less common on purpose so that a ton of really good loot can't be gotten for nearly free. However, if there were only regular vaults but two types of keys, then this would reduce the amount of unnecessary items. My opinion is that if ominous vaults were removed and only regular vaults existed instead (and could work with ominous keys), and that ominous keys dropped less often from spawners, that would balance the ease of the battles with the value of the loot aqcuired.