CE hard is not glitchy it just has tighter windows
For example getting hit when invisible you are doing it too slow crotA sees you faster than before
But you can't practice that invis move as only ce hard has that reaction time
Sword bearer going to ogre room issue there is that if you hit him in the wrong spot he runs away the wrong spot is there in normal but in hard it is a bigger spot so he is more likely to run away
Now the real issue is this a valid hard mode and the answer is no it is no more than an old school mode of throw more enemies at a higher level and make them faster until they die mode