Well, even with Tritoma, it takes 2-3 minutes to clear the stage. Most of the stage is dealing with guts wall.
The best way to fix it would be increasing Rose Medal drops. Like they did in the past with Blue Medals. Farming Rose Medals once every 3-4 months during limited event was okay. But farming it each month is tiring and not fun. I just hope Hraesvelgr stay has good as they where with medal drop. You could make way over the needed amount of Rose Medals just by doing it normally without forcing.