Really there are only a few heroes who are OP in EM because of the style of EM, the fast money, fast XP, etc. Rather than trying to change the heroes, thereby interrupting the way normal mode works (and it would never happen anyway), my suggestion wouldn't interfere with normal mode at all.
Remove Elder Parasite from EM. It's too easy to acquire with the fast money and it's too much of an overpowered item early game, as in the case of Chronos or Magebane. The movement speed and 100 attack speed just breaks the game completely from start to finish.
It's the main choice for carries by level 6-8 and for good reason, it's an overpowered item in EM. Leave Elder parasite in Normal Mode and remove it from EM.
I'm with the guy above me.. NM works for a reason, it's balanced.
Agree, there are many things which unbalance EM.
Trying to balance EM by changing one item is like making graphics for the colourblind by replacing 200 pixels of colours they can't distinguish with colours they can.