So personally I like the crucible how it is. However, I’ve seen a ton of people who don’t. Personally I’d hate to see it nerfed into the ground, becoming a walk in the park from jump, so I think I might have come up with a solution.
Give people who have already got to Echo Knight the option to skip the floors.
Double (or more) Echo Knight’s HP, possibly increase his damage. Each floor you beat, lowers his HP (and possibly damage).
This way, if you chose to skip floors, you’ll have a significantly more difficult boss fight. Which is no problem for those max level who just want to farm him.
Also, it allows people just starting the crucible the ability to learn his attack patterns, while making it very hard to beat his fully buffed form. Once they feel confident in knowing his patterns, they can go through the floors to weaken him, and have a more manageable fight.