As far as I know, the only major thing they changed after the Test Servers was the amount of summons in each room. While this of course makes everything harder, it never felt to me like the biggest problem or danger of the fights. Lokathmor requires a perfect execution to avoid the explosion and to do it in time, Mazzinor requires perfect execution specially from the EK and also RPs to survive the explosion, Ghulosh requires coordination and mechanics to go through it's immune fase, and Gorzindel is just way easier than the others.