Throw awat the iLv system, implement a PvE Rank system.

[Lurkios]

Fundamentally contradictory statement, since it can easily be completed at ilvl57 with competent players and will still be hopeless at ilvl75 with crappy players.

Saying things does not make those things truths. If you're attempting to deny that you have a better chance of completing content in an efficient manner with a random sampling of ilvl75 players than you do with a random sampling of ilvl57 players you are a fool.