Allow me to disagree with you there.
The rooms are balanced, you just need the correct strategies. Do not blame the dungeon, there are good strategies that work just fine. Many guilds and solo players can accomplish that dungeon with extreme ease. Again, it all falls on the right strategy.
What you are suggesting will make the dungeon LESS competitive. Since it will be so easy to do, it will lsoe the entire fun of it + punish players that took hours on planing a team and develop a team that can accomplish the dunegeon (no matter what room you get).
I can tell you, I have done that dungeon Solo more than 100 times (I provide services for it), and my success rates are like 99%. I can't think the last time I have lost a run. I have also ran with a group, which was also accomplishable.
There are certain conditions ofc, but it all part of your team, and strategy you develop.
This suggestion is, imo, not a viable suggestion.