I honestly don't see how this makes Sch more unique. The changes you've stated here were in short:
Make Aetherflow have a longer cooldown
Remove MP regain from Energy Drain
Roll Back Lustrate from 25% > 20%

and you mentioned changing Sustain back to a HP-spell, rather than MP.

This doesn't change the way the class plays, just makes it harder to play. I am happy with the adjustments to Sch in 2.1... sure I would have liked for sustain to remain HP based, but I know that I can run out of MP very quickly if I have to tank + raid heal because the other healer is slacking. Even in some 4 man content (WP speed or Pharos) I can find myself running on empty if people aren't watching what's going on and I have to spam heal / AoE heal. perhaps this will change as I transition from darklight to Myth/allagn but I don't think it will change much!